If you travel about 70 miles west of Key West, Florida, you'll hit Dry Tortugas National Park. One of the main attractions of this National Park is the largest what in the United States?

Dry Tortugas National Park was once known as Fort Jefferson National Monument, and is home to the massive but incomplete Fort Jefferson, a massive fortress that's made of 16 million bricks and covers 16 acres. In addition to the fort, Dry Tortugas is made up of a small group of islands, ideal for fishing, snorkeling, and swimming in the Gulf of Mexico.

Asked by Tom Cohen · Last updated 5 years ago · 1.6K views