The Most Beautiful Castles, Palaces and Fortresses in the United States
6 places · updated 14 October 2026
In short: By our ranking, the most beautiful castles, palaces and fortresses in the United States are Castillo San Felipe del Morro, Hearst Castle and Fort Jefferson (Dry Tortugas). The list covers 6 castles, palaces and fortresses. Last updated 14 October 2026.
The fortresses and palaces of the United States record two very different ages of building. The first is the age of empire and coastal defence, when Spain fortified its Caribbean and Florida ports against rival powers and the young American republic later ringed its coasts with masonry forts. The second is the Gilded Age, when industrial fortunes paid for mansions modelled on European palaces and castles, built with imported marble, art and even whole ceilings.
Castillo San Felipe del Morro in San Juan, begun by the Spanish in 1539, rises in tiers of stone from the sea to guard the entrance to San Juan Bay. In St. Augustine, the Castillo de San Marcos, built between 1672 and 1695, is the oldest masonry fort in the continental United States, made of coquina, a soft stone of compacted shells. Fort Jefferson on Garden Key in the Dry Tortugas is a vast hexagonal fort of more than sixteen million bricks, set alone in turquoise water far beyond Key West.
The palaces belong to another world. The Breakers in Newport, completed in 1895 for Cornelius Vanderbilt II to designs by Richard Morris Hunt, recreates an Italian Renaissance palazzo on the Atlantic shore. Hearst Castle, built for William Randolph Hearst by the architect Julia Morgan on a hilltop above San Simeon, gathers Spanish and Italian antiques around the marble Neptune Pool. On the South Rim of the Grand Canyon, the Desert View Watchtower by Mary Colter echoes Ancestral Puebloan towers, its interior painted by the Hopi artist Fred Kabotie.
In this list
| # | Place | Type | UNESCO |
|---|---|---|---|
| 1 | Castillo San Felipe del Morro | Fort | |
| 2 | Hearst Castle | Palace | |
| 3 | Fort Jefferson (Dry Tortugas) | Star fort | |
| 4 | The Breakers | Palace | |
| 5 | Castillo de San Marcos | Star fort | |
| 6 | Desert View Watchtower | Watchtower |
01 Castillo San Felipe del Morro
United States · 3.5 km from San Juan18.471° N 66.124° W
Joshua Wood · CC BY-SA 3.0 Work began in 1539 on the orders of Charles V, with a small tower and a water battery placed on the rocky promontory, the morro that gives the fort its name. The design still seen today was drawn in 1587 by Field Marshal Juan de Tejeda and the Italian military engineer Bautista Antonelli, as part of a plan to fortify Spain's key ports from Havana to Cartagena.
Did you know? Its walls are a sandwich: dressed limestone and sandstone blocks on both faces with rubble packed in between.
02 Hearst Castle
United States35.685° N 121.168° W
Image by sarangib from Pixabay Morgan, who in 1904 had become the first woman licensed as an architect in California, designed every part of it, from the reinforced concrete structure to the tiles, but much of the interior was assembled from Europe.
Did you know? For more than twenty years of near-constant work on the hill, Julia Morgan's fees came to only about $70,755.
03 Fort Jefferson (Dry Tortugas)
Fort Jefferson
United States24.628° N 82.873° W
U.S. National Park Service · Public domain The rhythm of the building is its great beauty. Row after row of arched casemates run around the courtyard, each arch framing a slice of sea or sky. Work went on for decades and the fort was never truly finished.
Did you know? During the Civil War two steam condensers distilled around 7,000 gallons of seawater a day to keep the garrison supplied.
04 The Breakers
United States · 2.6 km from Newport41.470° N 71.299° W
UpstateNYer · CC BY-SA 3.0 Vanderbilt bought the property in 1885; when the earlier mansion on the site, built for Pierre Lorillard IV, burned in 1892, he asked Hunt for a replacement that would be as fireproof as possible. The result has a structure of masonry and steel trusses with no wooden framing, and its boilers were placed in a vault under the front lawn, away from the house.
Did you know? Alice Vanderbilt's oval bedroom had four closets, allowing for as many as seven changes of clothes in a day, and hidden corridors let maids work unseen.
05 Castillo de San Marcos
United States · 0.5 km from St. Augustine29.898° N 81.311° W
National Park Service · Public domain Spain had guarded St. Augustine, founded in 1565 by Pedro Menéndez de Avilés, with a string of wooden forts after Francis Drake attacked the town in 1586. When the English privateer Robert Searles burned the town in 1668, the crown approved a stone fortress. The Spanish engineer Ignacio Daza designed it, the first stones were laid in October 1672 and the core was finished in 1695.
Did you know? The moat was usually kept dry, but in case of a land attack it could be flooded with seawater to a depth of about 30 centimetres.
06 Desert View Watchtower
United States36.044° N 111.826° W
TeKappa · CC BY-SA 4.0 The views are the widest along this rim. From the observation level of the tower, at about 7,522 feet the highest point on the South Rim, the eye takes in the eastern Grand Canyon, stretching away to the east. Inside, the tower is a work of art in its own right.
Did you know? A band of white stones near the top fades out as it circles the tower, a decorative trick Colter borrowed from Chaco Canyon.
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 beautiful castles, palaces and fortresses in the United States?
- On our list, Castillo San Felipe del Morro ranks first, followed by Hearst Castle and Fort Jefferson (Dry Tortugas).
- What is coquina and why was it used for the Castillo de San Marcos?
- Coquina is a sedimentary stone made of compacted shell fragments, quarried locally on Anastasia Island. Its porous texture absorbed the impact of cannonballs instead of shattering, which helped the fort withstand bombardment.
- Why was Fort Jefferson never finished?
- Construction ran from 1846 to 1875, but the walls began to crack as the heavy fort settled into its foundations, and the arrival of rifled cannon made brick forts of this kind obsolete before the work was complete.
- Who designed Hearst Castle?
- Hearst Castle was designed by Julia Morgan, one of the first women licensed as an architect in California. She worked on it for William Randolph Hearst for nearly three decades, from 1919 to 1947.
- How many castles, palaces and fortresses are on this list in the United States?
- The list covers 6 castles, palaces and fortresses.