swap_horiz Fort Jefferson Alternatives

1

Castillo de San Marcos

Castillo de San Marcos is the oldest masonry fort in the continental United States, built by Spain in St. Augustine, Flo...

Spanish USA Florida Colonial

8.6 Great

2

Aragonese Castle of Ischia

Island fortress off Ischia, Italy, with ancient roots rebuilt by Alfonso V of Aragon in 1441 and connected to the island...

Italy Coastal Island Naples

8.3 Great

3

Fort McHenry

Fort McHenry is a star-shaped harbor defense fort in Baltimore, Maryland, whose successful resistance to a British naval...

USA Coastal Maryland Star Fort

8.2 Great

4

Fort Sumter

Fort Sumter is a sea fort in Charleston Harbor, South Carolina, where Confederate forces fired the opening shots of the...

USA 19TH Century Coastal South Carolina

8.0 Great

5

Citadel of Corfu

A Venetian-built fortification on the eastern promontory of Corfu town, Greece, developed from the 15th century onward t...

Coastal Island Greece 16TH Century

8.0 Great

6

Fort Point

US Army fort completed in 1861 at the base of the Golden Gate in San Francisco, the only complete third-system masonry f...

USA California Coastal Civil War

8.0 Great

7

Oscarsborg Fortress

A Norwegian island fortress in the Oslofjord, built in 1845, renowned for sinking the German heavy cruiser Blücher durin...

19TH Century Coastal Norway Island

7.5 Good

8

Vaxholm Fortress

A 16th-century Swedish island fortress guarding the sea approach to Stockholm, established on orders of King Gustav Vasa...

Sweden Coastal Island 16TH Century

7.5 Good

9

Fort Pulaski

Civil War-era fort on Cockspur Island, Georgia, where Union forces first used rifled artillery in 1862 to breach its mas...

USA 19TH Century Coastal Civil War

7.5 Good

10

Fort Laramie

Originally a fur-trading post established in 1834 in present-day Wyoming, it became a key US Army garrison and treaty si...

USA 19TH Century Wyoming Frontier

7.5 Good

11

Fort Mackinac

British fort on Mackinac Island, Michigan, constructed around 1780–1781 during the Revolutionary War and transferred to...

18TH Century USA Colonial Island

7.5 Good

12

Fort Monroe

Largest stone fort ever built in the United States, constructed 1819–1834 at Old Point Comfort, Virginia, and garrisoned...

USA 19TH Century Coastal Virginia

7.3 Good

13

Fort Vancouver

Hudson's Bay Company post established in 1824 on the Columbia River in present-day Washington State, the principal hub o...

USA 19TH Century Washington Frontier

7.2 Good

14

Fort Snelling

First permanent US Army post in the upper Midwest, established in 1819 at the confluence of the Mississippi and Minnesot...

USA Confluence 19TH Century Frontier

7.0 Good

15

Fort Morgan

Confederate fort guarding the entrance to Mobile Bay, Alabama, captured by Union forces in August 1864 during Admiral Da...

USA Coastal Civil War Alabama

7.0 Good

16

Fort Pickens

Union-held fort on Santa Rosa Island at Pensacola, Florida, one of the few Southern forts never taken by Confederate for...

USA Coastal Florida Civil War

7.0 Good

17

Diu Fort

Portuguese fort on Diu island off Gujarat, India, built in 1535 following the Battle of Diu and held as a Portuguese enc...

India Coastal Island 16TH Century

7.0 Good

18

Fort Clinch

Antebellum US masonry fort on Amelia Island, Florida, begun in 1847 and occupied by both Confederate and Union forces du...

USA Coastal Florida Civil War

6.8 Fair

19

Sindhudurg Fort

Sea fort built by Maratha king Chhatrapati Shivaji Maharaj between 1664 and 1667 off the coast of Malvan in Maharashtra,...

India Coastal Island 17TH Century

6.8 Fair

20

Fort Bullen

British fort established in 1826 at the mouth of the Gambia River primarily to intercept slave traders, later serving as...

19TH Century Coastal British Colonial

6.0 Fair