The Greatest Engineering Wonders in North America

33 places in 4 countries · updated 13 October 2026

1. 01 Hoover Dam

   United States · 9.4 km from Boulder City36.016° N 114.738° W

   

   The engineering problems were enormous. Poured in one mass, the concrete would have taken over a century to cool and would have cracked as it did; instead it was placed in interlocking blocks threaded with cooling pipes carrying chilled water. The human cost was heavy too.

   Did you know? 'High scalers' dangled on ropes down the canyon walls, prying off loose rock with jackhammers and dynamite before pouring could start.

   More about Hoover Dam →

2. 02 Karl G. Jansky Very Large Array

   United States34.079° N 107.618° W

   

   The VLA is operated by the US National Radio Astronomy Observatory. Construction began in the 1970s, and the completed array was formally dedicated in 1980. A major electronics overhaul in the 2000s replaced receivers, fibre-optic links and the correlator; at its completion, on 31 March 2012, the telescope was rededicated and named after Karl Jansky, the Bell Labs engineer who first detected radio waves from the Milky Way in 1932.

   Did you know? The antennas are moved every three to four months, so the array works through its full cycle of configurations roughly every 16 months.

   More about Karl G. Jansky Very Large Array →

3. 03 Griffith Observatory

   United States · 9.9 km from Los Angeles34.119° N 118.300° W

   

   The building, by John C. Austin and Frederic M. Ashley after sketches by Russell W. Porter, mixes Greek and Beaux-Arts forms with Moderne touches and wears a Greek key pattern round its walls. Under the rotunda a Foucault pendulum swings to show the Earth turning, beneath ceiling murals by Hugo Ballin.

   Did you know? In the scale model of the Solar System, the Sun is represented by the full width of the Leonard Nimoy Event Horizon Theater.

   More about Griffith Observatory →

4. 04 Maunakea Observatories

   United States19.822° N 155.475° W

   

   The reason they are all here is the air. The summit sits above most of the atmosphere's water vapour, the skies are dark and the air is steady, dry and clean, with little cloud overhead — conditions that make it outstanding for both optical and infrared work. 2-metre telescope saw first light in 1970, and the Canada–France–Hawaii Telescope followed in the 1970s.

   Did you know? The Canada–France Ecliptic Plane Survey, run from the summit, found distant bodies beyond Neptune such as 2003 QX113.

   More about Maunakea Observatories →

5. 05 Golden Gate Bridge

   United States · 8 km from San Francisco37.820° N 122.479° W

   

   Chief engineer Joseph Strauss ran an unusually safety-conscious site for 1933: hard hats were made mandatory for the first time on any American construction project, and Strauss spent $130,000 — a large sum for the Depression era — on a safety net slung the full length of the structure beneath the work deck. It caught nineteen falling men over the course of construction, who banded together afterward calling themselves the Halfway to Hell Club.

   Did you know? Charles Ellis designed a steel arch to carry the roadway over Fort Point, so the Civil War-era fort beneath the south end did not have to be demolished.

   More about Golden Gate Bridge →

6. 06 Mount Washington Cog Railway

   United States44.274° N 71.332° W

   

   The engineering is visible everywhere. Marsh's rack is a ladder-like centre rail engaged by a toothed wheel on the locomotive, and much of the line runs on trestles. The steepest stretch, the curving trestle known as Jacob's Ladder, has a grade of about 37 per cent.

   Did you know? Workers once raced down the track on wooden slideboards called Devil's shingles; the record descent took 2 minutes 45 seconds before the boards were banned in 1908.

   More about Mount Washington Cog Railway →

7. 07 Bingham Canyon Mine

   United States · 33.7 km from Salt Lake City40.522° N 112.149° W

   

   Copper ore was noticed here in 1848 by two Mormon brothers, Sanford and Thomas Bingham, who grazed cattle in the canyon; Brigham Young advised them to leave it alone, and they did, though the canyon kept their name. Small mines of gold, silver, lead and copper followed from 1863.

   Did you know? Ore is ground to the fineness of face powder, and the resulting concentrate is piped about 27 km to a smelter at Magna on the Great Salt Lake.

   More about Bingham Canyon Mine →

8. 08 Bixby Creek Bridge

   United States · 25.4 km from Monterey36.371° N 121.902° W

   

   Before the bridge, travellers on this stretch of coast had to follow the Old Coast Road, which detoured about eleven miles inland to get around the canyon. The state highway engineer was C. H. Purcell and the bridge was designed by F. W. Panhorst; the San Francisco firm Ward Engineering won the contract in August 1931. Construction began that same month and the bridge was finished in October 1932, slightly under budget, and opened in November.

   Did you know? Between 1998 and 2000 the bridge received a $20 million seismic retrofit, including deep piles and post-tensioning of the whole deck.

   More about Bixby Creek Bridge →

9. 09 Brooklyn Bridge

   United States · 1.8 km from New York City40.706° N 73.996° W

   

   Washington's ordeal turned out to be slower and stranger. To lay the towers' foundations, workers descended into huge airtight timber boxes called caissons, sunk to the riverbed and kept dry by pumped-in compressed air. Coming back up too fast, men doubled over with joint pain, slurred speech and paralysis — a condition so new doctors named it after the job: caisson disease, what divers now call the bends.

   Did you know? In December 1870 the timber roof of the Brooklyn caisson caught fire below the riverbed, delaying construction for months.

   More about Brooklyn Bridge →

10. 10 Sloss Furnaces

    United States · 3.3 km from Birmingham33.521° N 86.791° W

    

    The company was founded in 1881 by Colonel James Withers Sloss, one of the men behind the city of Birmingham itself, which grew up precisely because coal, limestone and iron ore, the three ingredients of pig iron, lie close together in the surrounding hills. The first furnace was blown in during April 1882 and produced about 24,000 tons of iron in its first year.

    Did you know? Superintendent James Pickering Dovel ran construction for 21 years from 1909 and was credited with 17 patents for furnace improvements.

    More about Sloss Furnaces →

11. 11 New River Gorge Bridge

    United States · 33.2 km from Beckley38.069° N 81.082° W

    

    S. Route 19 built under the Appalachian Development Highway System to open up a region whose coal towns had faded with the mechanisation of mining. Before it, crossing the gorge meant winding down to the one-lane Fayette Station Bridge near the river and up again; the new span cut that trip from about 45 minutes to 45 seconds. It was designed by the Michael Baker Company, under chief engineer Clarence V. Knudsen and bridge engineer Frank J. S.

    Did you know? Its national park is unusual in having a man-made structure, the bridge, as its main feature rather than a natural wonder.

    More about New River Gorge Bridge →

12. 12 Green Bank Telescope

    United States38.433° N 79.840° W

    

    The GBT was born from an accident. On the night of 15 November 1988, the observatory's 300-foot telescope, then the largest instrument on the site, suddenly collapsed after a key steel support failed. Congress funded a replacement, construction began in 1990, and the new telescope saw first light in August 2000.

    Did you know? Construction began on 19 December 1990, and regular science operations started in 2001 after a decade of building.

    More about Green Bank Telescope →

13. 13 Heceta Head Light

    United States44.137° N 124.128° W

    

    The tower itself is modest, 56 feet high, but it carries a first-order Fresnel lens made by the English firm Chance Brothers, and its white flash every ten seconds reaches some 21 nautical miles out to sea, making it the strongest light on the Oregon coast. The light was automated in 1963 and listed on the National Register of Historic Places in 1978.

    Did you know? After a 1961 rockslide cut the power, the keepers turned the lens by hand from midnight until 7:30 in the morning.

    More about Heceta Head Light →

14. 14 Aqueduct of Padre Tembleque

    Acueducto del Padre Tembleque

    Mexico · 30.9 km from Pachuca19.836° N 98.662° W

    • UNESCO World Heritage

    

    The project was the life's work of Francisco de Tembleque, a Franciscan friar from the province of Toledo who arrived in 1542 and, seeing how the lack of water afflicted the people of Otumba, set out to bring it from springs more than 40 km away. The system was built from the 1550s onwards, largely by Indigenous communities, and a written agreement of 1553 in which the leaders of Zacuala agreed to share their water with Otumba survives.

    Did you know? Besides the main arcade, two smaller arcades of 46 and 13 arches carry the channel across other ravines along the route.

    More about Aqueduct of Padre Tembleque →

15. 15 White Pass and Yukon Route

    Canada59.625° N 135.138° W

    

    The line kept the Yukon supplied for decades, carrying ore, freight and passengers, until falling metal prices and mine closures stopped it in October 1982. It returned in May 1988 as a heritage railway, and today its trains climb from Skagway to the summit and on to Fraser, Bennett and Carcross. In 1994 it was named an International Historic Civil Engineering Landmark, an honour it shares with works such as the Panama Canal and the Eiffel Tower.

    Did you know? In October 1942 the US Army leased the line, and its 770th Railway Operating Battalion ran the trains until civilian control returned in late 1944.

    More about White Pass and Yukon Route →

16. 16 Monticello Dam

    United States38.513° N 122.105° W

    

    The lake behind the dam is one of the largest in the state, about 26 miles long and able to hold 1.6 million acre-feet. It covers the Berryessa Valley, once a farming district, and the town of Monticello, settled in the 1840s and home to around 250 people when it was cleared; some 300 graves were moved before the water came. The reservoir first filled in April 1963.

    Did you know? The arch is about 100 feet thick at its base but only 12 feet thick at the crest.

    More about Monticello Dam →

17. 17 Toronto Power Generating Station

    Canada · 3.9 km from Niagara Falls43.072° N 79.074° W

    

    The station was built by the Electrical Development Company of Ontario, a venture of the financiers William Mackenzie, Frederic Nicholls and Henry Pellatt, and it opened in 1906 to send power to Toronto. It was the first hydroelectric plant at Niagara Falls owned entirely by Canadians.

    Did you know? Visitors entered a foyer with marble walls and floors, and the building included a board room and a public waiting room.

    More about Toronto Power Generating Station →

18. 18 Crystal Mill

    United States39.059° N 107.104° W

    

    It was built in 1893 by George C. Eaton and B. S. Phillips, promoters of the Sheep Mountain Tunnel and Mining Company, to power the Sheep Mountain Tunnel. In its working years it was called the Sheep Mountain Power House, or the Lost Horse Mill after the mining claim it stands on; the word "mill" comes from a small three-stamp ore-crushing mill that stood in a separate building immediately to the south and has not survived.

    Did you know? By 1915 the camp's population had fallen to just eight people.

    More about Crystal Mill →

19. 19 Kennecott Mines

    Kennecott

    United States61.486° N 142.889° W

    

    The story began in 1900, when two prospectors, "Tarantula" Jack Smith and Clarence Warner, noticed a patch of green high on a ridge that looked like a meadow in an impossible place. It was malachite over rich chalcocite, and the claim they staked became the Bonanza mine. P. Morgan, whose Alaska Syndicate financed a railway 196 miles to the port of Cordova. 4 million.

    Did you know? A US Geological Survey geologist found the same copper outcrop only days after the prospectors, but too late to stake a valuable claim.

    More about Kennecott Mines →

20. 20 Split Rock Lighthouse

    United States47.200° N 91.368° W

    

    It exists because of a disaster. In November 1905 the Mataafa Storm swept Lake Superior and some 29 ships were lost or damaged. The lighthouse followed, completed in 1910 for about $75,000 including buildings and land, and first lit on 31 July that year. There was no road: every brick, beam and piece of equipment came by water and was hoisted up the cliff by crane.

    Did you know? The light burned kerosene vapour until 1940, when it was electrified with a 1,000-watt bulb.

    More about Split Rock Lighthouse →

21. 21 Royal Gorge Bridge

    United States38.462° N 105.325° W

    

    The bridge was never meant to carry through traffic. It was conceived purely as an attraction by Lon P. Piper, head of a San Antonio company, who brought in George E. Cole as chief engineer. Work began on 5 June 1929 and was finished that November, in about six months, without a single death or serious injury, for a cost of $350,000.

    Did you know? Texas oilman Clint Murchison bought the bridge's leasing rights in 1947 and, a longtime employee said, never once came to see it.

    More about Royal Gorge Bridge →

22. 22 Carrie Furnace

    United States · 9.7 km from Pittsburgh40.413° N 79.890° W

    

    The first Carrie furnaces were built in the 1880s; Andrew Carnegie bought the site in 1898, and it passed into US Steel on the company's founding in 1901. Molten iron from here was carried across the river to the Homestead mills on the site's own hot metal bridge, which still stands. At its peak the site produced 1,000 to 1,250 tons of iron a day.

    Did you know? The historic Carrie site once spread across about 168 acres on both banks of the Monongahela River.

    More about Carrie Furnace →

23. 23 Going-to-the-Sun Road

    United States48.695° N 113.817° W

    

    The engineering is the point. Rather than blasting a highway through the mountains, the builders laid the road along the grain of the land, with stone guard walls and arches built from local rock so that the work would sit quietly in the scenery. On the western climb it makes a single great hairpin, the Loop, and then traverses the Garden Wall, a knife-edged ridge with the road cut into its face and the valley falling away beneath.

    Did you know? The road was first proposed in 1917 by park superintendent George Goodwin and cost about $2.5 million by the time it opened end to end.

    More about Going-to-the-Sun Road →

24. 24 Pemaquid Point Light

    United States43.837° N 69.506° W

    

    The first tower here was built in 1827, but it was so badly made that it soon began to crumble: the builder had mixed the mortar with salt water. It was replaced in 1835 by the present conical stone tower, whose light stands 79 feet above the sea. In 1856 it received a fourth-order Fresnel lens, which is still in service, one of only a handful of such lenses still working in Maine. The station was automated in 1934. One of its keepers, Marcus A.

    Did you know? Maine residents chose the lighthouse by popular vote for their state quarter, which also shows a three-masted schooner modelled on the Victory Chimes.

    More about Pemaquid Point Light →

25. 25 Pikes Peak Cog Railway

    The Broadmoor Manitou and Pikes Peak Cog Railway

    United States · 12.1 km from Colorado Springs38.856° N 104.931° W

    

    The idea came from Zalmon G. Simmons, the bedding manufacturer, who rode a mule to the top in 1888 while surveying telegraph routes and came back convinced that the mountain needed a gentler way up. Construction began in 1889, largely by Italian labourers working with picks and pack animals; limited service ran to the Halfway House in 1890 and the first train reached the summit on 30 June 1891.

    Did you know? By 2017 the worn track was eating through cog wheels twice as fast as in the 1980s, which forced the line to shut for a full rebuild.

    More about Pikes Peak Cog Railway →

26. 26 Durango and Silverton Narrow Gauge Railroad

    United States · 2.6 km from Durango37.297° N 107.871° W

    

    The building of it was a feat of raw labour. Around five hundred men, largely Chinese and Irish immigrants, pushed the grade up the Animas valley in a little over nine months, and at the narrowest point they had to blast a ledge out of sheer granite. That ledge, the High Line, is the moment everyone waits for: the train creeps along a shelf roughly 300 feet above the river, with nothing but air between the window and the white water below.

    Did you know? Marilyn Monroe had a small bit part in A Ticket to Tomahawk, a 1950 film shot along the railroad.

    More about Durango and Silverton Narrow Gauge Railroad →

27. 27 Peggys Point Lighthouse

    Peggy's Point Lighthouse

    Canada · 30.8 km from Halifax44.492° N 63.919° W

    

    A light has marked the eastern entrance to St. Margarets Bay since 1868, when the first, wooden lighthouse was built here. The present octagonal tower of reinforced concrete, about 15 metres tall, replaced it in the mid-1910s. It was automated in 1958 and is run by the Canadian Coast Guard; its light has changed colour over the decades, from white to green in the late 1970s and to red in 2007.

    Did you know? Grooves scraped into the bedrock by moving glacial ice are still visible on the outcrops around the lighthouse.

    More about Peggys Point Lighthouse →

28. 28 Cape Hatteras Lighthouse

    United States35.251° N 75.529° W

    

    The light exists because of Diamond Shoals, shifting sandbars that reach far out from Cape Hatteras into the Atlantic. Here the warm Gulf Stream meets colder water from the north, storms build quickly, and so many ships were lost over the centuries that the waters became known as the Graveyard of the Atlantic. The present tower was completed in 1870, designed by Dexter Stetson.

    Did you know? The present tower was struck by lightning in the spring of 1879, and cracks appeared in its masonry afterwards.

    More about Cape Hatteras Lighthouse →

29. 29 Portland Head Light

    United States43.623° N 70.208° W

    

    It is the oldest lighthouse in Maine and among the first completed by the young United States: work began in 1787, George Washington directed its completion with money appropriated by Congress, and the light was first lit on 10 January 1791.

    Did you know? At first the light came from sixteen whale-oil lamps; a Fresnel lens was not installed until 1855.

    More about Portland Head Light →

30. 30 Miraflores Locks, Panama Canal

    Miraflores

    Panama · 5.9 km from Balboa8.997° N 79.592° W

    

    The locks were completed in 1913 and opened with the canal in 1914. 5 metres wide and about 320 metres long, closed by steel mitre gates about two metres thick whose single leaves weigh up to around 600 tonnes. Water moves by gravity alone, running from the lake through culverts in the walls and the chamber floors, with no pumps at all.

    Did you know? The towing locomotives are called mules after the pack animals once used to cross the isthmus; a large ship may be held by eight of them.

    More about Miraflores Locks, Panama Canal →