History & Culture

Navigational Chart of Dry Tortugas from 1874.

NPS

The rich cultural heritage of the Dry Tortugas all begins with its location 70 miles west of Key West, Florida. The seven keys (Garden, Loggerhead, Bush, Long, East, Hospital, and Middle) collectively known as the Dry Tortugas, are situated on the edge of the main shipping channel between the Gulf of Mexico, the western Caribbean, and the Atlantic Ocean. The strategic location of the Dry Tortugas brought a large number of vessels through its surrounding waters as they connect the Atlantic Ocean and the Gulf of Mexico. Early on, the shipping channel was used among Spanish explorers and merchants traveling along the Gulf Coast.

 

Sally Port entrance into Fort Jefferson on Garden Key

Linda Friar, National Park Service

Fort Jefferson on Garden Key

Fort Jefferson, the largest all-masonry fort in the United States, was built between 1846 and 1875 to protect the nation's gateway to the Gulf of Mexico. Supply and subsidence problems and the Civil War delayed construction. The fort was never completed because of fears that additional bricks and cannon would cause further settling and place more stress on the structure and the cistern system. Distinguishing features include decorative brickwork and 2,000 arches. Time, weather, and water continue to take their toll, necessitating ongoing stabilization and restoration projects.

 

Harbor Light at Fort Jefferson

National Park Service, John Dengler

Fort Jefferson and a Harbor Light

A large military fortress, Fort Jefferson, was constructed in the mid-19^th century as an effort for the United States to protect the extremely lucrative shipping channel. Low and flat, these islands and reefs pose a serious navigation hazard to ships passing through the 75-mile-wide straits between the gulf and the ocean. Consequently, these high risk reefs have created a natural “ship trap” and have been the site of hundreds of shipwrecks. A lighthouse was constructed at Garden Key in 1825 to warn incoming vessels of the dangerous reefs and later, a bricktower lighthouse was constructed on Loggerhead Key in 1858 for the same purpose. Discover and explore the rich heritage of Dry Tortugas National Park on the history and culture pages.