Fort Jefferson is a massive but unfinished coastal fortress. It is the largest brick masonry structure in the Americas, and is composed of over 16 million bricks. Among United States forts, only Fort Monroe in Virginia and Fort Adams in Rhode Island are larger. The fort is located on Garden Key in the lower Florida Keys within the Dry Tortugas National Park, about 70 miles (110 km) west of the island of Key West. The Dry Tortugas are part of Monroe County, Florida, United States.
The fort was built in 1861 and is located 90 miles west of Key West. It’s now a national park.
It was built to maintain an American presence in the Gulf and to scare off pirates. During the Civil War it was mainly a prison. But it looks to me like it would be one great place to set up some tents, crack open the beer and let the festivities begin.