The Most Remarkable Archaeological Sites in Lazio
10 places · updated 14 October 2026
In short: By our ranking, the most remarkable archaeological sites in Lazio are Colosseum, Roman Forum and Castel Sant'Angelo. The list covers 10 archaeological sites. Last updated 14 October 2026.
Lazio was the core of the Roman world, and its ancient sites are the buildings that taught the rest of the empire how to build. Roman concrete, brick and travertine let architects span spaces no one had covered before, and the city kept many of its monuments by turning them into churches, fortresses and quarries rather than abandoning them. Around Rome, the countryside preserved what the city reused: villas, ports and roads left to the fields.
The Colosseum, opened under Titus in 80, could hold tens of thousands of spectators and still defines the image of Rome. Below the Palatine, the Roman Forum gathers temples, basilicas and triumphal arches along the Sacred Way. The Pantheon, rebuilt under Hadrian, is the best-preserved building of ancient Rome, open to the sky through the oculus in its dome, and Trajan's Column still stands where it rose beside his forum.
Hadrian also left two of the most personal monuments. His mausoleum on the Tiber became Castel Sant'Angelo, a papal fortress linked to the Vatican by a raised passage. His villa near Tivoli spreads across a whole landscape of pavilions, baths and pools, including the colonnaded Canopus. At Ostia, Rome's ancient port, whole streets of apartment blocks, warehouses, baths and a theatre show how ordinary Romans lived.
In this list
| # | Place | Type | UNESCO |
|---|---|---|---|
| 1 | Colosseum | Archaeological site | |
| 2 | Roman Forum | Archaeological site | |
| 3 | Castel Sant'Angelo | Castle | |
| 4 | Trajan's Column | Sculpture | |
| 5 | Palatine Hill | Archaeological site | |
| 6 | Trajan's Market | Ruins | |
| 7 | Hadrian's Villa | Open-air museum | ✓ |
| 8 | Pantheon, Rome | Archaeological site | |
| 9 | Domus Aurea | Ruins | |
| 10 | Ostia | Archaeological site |
01 Colosseum
Colosseo
Italy · 1.2 km from Rome41.890° N 12.492° E
Image by MARTINOPHUC from Pixabay Its life after the games ended in the early 5th century was almost as eventful as its life as an arena. Medieval Romans turned it into housing and workshops, then a fortress for rival noble families; later centuries saw it stripped for building material, its travertine blocks hauled off to build palaces and even St Peter's Basilica. A major earthquake in 1349 collapsed the entire outer wall on the south side, where the ground is softer — which is why, looking at it today, one side reads as a complete ring and the other as a ragged cross-section, exposing the inner corridors like a cutaway diagram. Only about a third of the original structure survives.
Did you know? The pockmarks covering the walls were left by medieval scavengers who hacked out the iron clamps that once held the stone blocks together.
02 Roman Forum
Foro Romano
Italy · 0.7 km from Rome41.892° N 12.485° E
Image by jensjunge from Pixabay After the empire fell the Forum was buried under silt and rubble and used as grazing land, the Campo Vaccino. Renaissance popes quarried it hard, above all in the 1540s when Paul III took its marble for the new St Peter's. Clearance began in 1803 at the Arch of Septimius Severus, and systematic state excavation from 1898; digging continues today. The travertine paving laid under Augustus is still visible, and the line of the Via Sacra, the road of the triumphal processions, still runs through the ruins between the two arches.
Did you know? Marble paving laid under Sulla in the 80s BC survived largely intact for over a thousand years, until the Norman sack of Rome in 1084.
03 Castel Sant'Angelo
Italy · 1.4 km from Rome41.903° N 12.466° E
Image by rainhard2 from Pixabay The detail that turns it from a fortress into a thriller set is the Passetto di Borgo: an elevated, roughly 800-metre corridor built into the old city wall, connecting the castle directly to the Vatican. It existed for exactly one purpose — getting a pope out fast — and it was used for real at least twice, most famously by Clement VII, who ran the length of it to escape into the castle while Rome was being sacked by mutinous imperial troops in 1527.
Did you know? Hadrian's ashes were laid here with those of his wife Sabina and his first adopted son, Lucius Aelius.
04 Trajan's Column
Colonna Traiana
Italy · 0.3 km from Rome41.896° N 12.484° E
Raffaele pagani · CC BY-SA 4.0 The column originally stood between the Greek and Latin halls of the Ulpian Library, whose upper floors gave readers a closer view of the reliefs. After Trajan's death in 117 the Senate had his ashes placed in golden urns inside the base. His statue on top vanished in the Middle Ages, and since 1587 the column has been crowned by a bronze Saint Peter placed by Pope Sixtus V. Because pollution has blurred the marble, plaster casts made in the 19th and 20th centuries are sometimes easier to read: complete sets can be seen in Bucharest and in the Cast Courts of London's Victoria and Albert Museum.
Did you know? The carved band is not uniform: it widens from about 1 metre near the bottom to about 1.2 metres higher up, helping viewers read the upper scenes.
05 Palatine Hill
Palatino
Italy · 1.2 km from Rome41.888° N 12.487° E
Livioandronico2013 · CC BY-SA 4.0 The rewards are space, greenery and a sense of layers: Iron Age huts, Republican houses, imperial palaces and Renaissance gardens on one hill. Paths lead down into the Forum.
06 Trajan's Market
Mercati di Traiano
Italy · 0.5 km from Rome41.896° N 12.486° E
NikonZ7II · CC BY-SA 4.0 Since 2007 the complex has housed the Museum of the Imperial Fora, which gathers finds from all of ancient Rome's imperial forums. It is a quieter and more understandable visit than the main Forum, and a good place to understand how Roman concrete architecture actually worked.
07 Hadrian's Villa
Villa Adriana
Italy · 24.9 km from Rome41.942° N 12.775° E
- UNESCO World Heritage
Elenadeca · CC BY 4.0 The scale of the place is easy to underestimate from photographs: at roughly 120 hectares, the villa complex included multiple bathing halls, at least one theatre, libraries, and a network of underground service tunnels wide enough for carts, built so the staff running the estate never had to be seen crossing its ornamental gardens. Hadrian eventually governed the empire from here rather than from Rome itself — proof that for an emperor who had seen the whole known world, home still had to contain all of it at once.
Did you know? The estate held more than 30 monumental buildings and covered an area larger than the city of Pompeii.
08 Pantheon, Rome
Pantheon
Italy · 0.4 km from Rome41.899° N 12.477° E
Image by falcon505 from Pixabay The building survived because it never stopped being used. In 609 the emperor Phocas gave it to Pope Boniface IV, who consecrated it as the church of Saint Mary and the Martyrs, and it is still a church. Among the tombs in its chapels are those of the painter Raphael and the first two kings of united Italy, Victor Emmanuel II and Umberto I. Outside, Piazza della Rotonda has a fountain topped by an Egyptian obelisk.
Did you know? In 663 the Byzantine emperor Constans II stripped the gilded bronze roof tiles and shipped them toward Constantinople.
09 Domus Aurea
Italy · 1.4 km from Rome41.891° N 12.495° E
Unknown author Unknown author · Public domain Nero's successors hurried to erase his memory. Within a few decades the palace was stripped, filled with earth and built over: the Flavian emperors drained the lake for the Colosseum, and Trajan raised his baths on top of the Oppian wing. Paradoxically, the burial preserved the paintings. Around the end of the 15th century they were rediscovered, and artists such as Pinturicchio, Ghirlandaio and Raphael were lowered into the dark chambers they took for caves, or grotte, to copy the fanciful painted ornament. From those 'grottoes' comes the word grotesque, and the style fed straight into Raphael's Vatican Loggias and, centuries later, into Neoclassical decoration.
Did you know? An artificial lake in Nero's grounds occupied the valley where the Colosseum was later built.
10 Ostia
Italy · 22.7 km from Rome41.754° N 12.287° E
Marie-Lan Nguyen ( User:Jastrow ) · CC BY 2.5 The city was cosmopolitan: eighteen shrines of Mithras have been found, as well as a synagogue, likely built in the late first century AD, which is the oldest yet identified in Europe. Saint Monica, the mother of Augustine of Hippo, died here in 387 while waiting to sail back to Africa. In late antiquity Ostia became a residential town for the wealthy, with marble-lined houses such as the Domus of Cupid and Psyche, but after the fall of the Western Empire it declined, and its last inhabitants left in the ninth century.
Did you know? The theatre dates from about 18 to 12 BC, in the reign of Augustus, and Caligula later gave the town its own aqueduct.
How this list is ranked
Places are chosen for how they look, not for how famous they are: each one has its own description and a photograph credited to its author. The order is a single world ranking that weighs the beauty of the place in curated photography together with how widely it is documented — the number of language editions of its encyclopedia article and how often that article is read in a year. The list is rebuilt as places are added, so the order and the counts on this page are always current.
Questions people ask
- What are the most remarkable archaeological sites in Lazio?
- On our list, Colosseum ranks first, followed by Roman Forum and Castel Sant'Angelo.
- What was Castel Sant'Angelo originally?
- It was built as the mausoleum of Emperor Hadrian in the second century. In the Middle Ages the popes turned it into a fortress and refuge, connected to the Vatican by the Passetto di Borgo.
- Why is Ostia Antica so well preserved?
- After Rome declined, its port silted up and was gradually abandoned, and the site was buried by river sediment instead of being built over. That left streets, houses and public buildings largely in place.
- How old is the Colosseum?
- Construction began under Vespasian around 70–72 AD, and it was inaugurated by his son Titus in 80 AD, making it nearly two thousand years old.
- How many archaeological sites are on this list in Lazio?
- The list covers 10 archaeological sites.