Dry Tortugas National Park, Florida, United States. Still in Key West, but this is where you board the boat to make it to Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Yankee Freedom - transport boat for Dry Tortugas National Park

Dry Tortugas National Park, Florida, United States. Safety briefing from Yankee Freedom

Dry Tortugas National Park, Florida, United States. Boat ride to Dry Tortugas National Park

Dry Tortugas National Park, Florida, United States. Passing the Coast Guard station on the boat ride to Dry Tortugas National Park, aboard Yankee Freedom.

Dry Tortugas National Park, Florida, United States. Dry Tortugas National Park

Dry Tortugas National Park, Florida, United States. Pulling up to Dry Tortugas National Park aboard Yankee Freedom.

Dry Tortugas National Park, Florida, United States. Docking at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. A sea plane is an alternate method of transportation to get to Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Entrance to Fort Jefferson on Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Entering Fort Jefferson.

Dry Tortugas National Park, Florida, United States. Still in Key West, but this is where you board the boat to make it to Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. First glimpses of Dry Tortugas National Park

Dry Tortugas National Park, Florida, United States. A picture of a sign showing where Dry Tortugas National Park is located. Well past Key West Florida.

Dry Tortugas National Park, Florida, United States. Fortified entrance on Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Lighthouse.

Dry Tortugas National Park, Florida, United States. This is a big field inside of Fort Jefferson that was used for training soldiers, recreation, etc.

Dry Tortugas National Park, Florida, United States. Entrance to Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. The outer moat wall of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. The beach at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fish while snorkeling off the shores of Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fish spotted while snorkeling.

Dry Tortugas National Park, Florida, United States. Conch shell found while snorkeling. This one was occupied.

Dry Tortugas National Park, Florida, United States. Sea-life spotted while snorkeling.

Dry Tortugas National Park, Florida, United States. More sea-life spotted while snorkeling at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Coral while snorkeling at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. A sunken ladder off the shores of Dry Tortugas National Park. Found this while snorkeling.

Dry Tortugas National Park, Florida, United States. Loggerhead Key is off in the distance with the large lighthouse.

Dry Tortugas National Park, Florida, United States. Walls of Fort Jefferson at Dry Tortugas National Park. This picture was taken from the moat wall.

Dry Tortugas National Park, Florida, United States. Moat wall.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. The harbor at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Bird Island. The island is closed to the public, allowing the birds to have their own space.

Dry Tortugas National Park, Florida, United States. Looking out from inside of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Heavily fortified walls at Fort Jefferson. Originally built to be attack proof, later used as a prison.

Dry Tortugas National Park, Florida, United States. Canon in Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Hallway in Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Tower of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Staircase in Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Looking out to the island from within Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. The color of the water is amazing at Dry Tortugas National Park. Looking out from Fort Jefferson.

Dry Tortugas National Park, Florida, United States. Large canon left behind from when Fort Jefferson was active. The size of this is incredible.

Dry Tortugas National Park, Florida, United States. Lighthouse on Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Bird Island. The birds scream day and night...

Dry Tortugas National Park, Florida, United States. From the top of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. View from atop Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. A gentle reminder that this truly is an island. Not much on the horizon line...

Dry Tortugas National Park, Florida, United States. The cell of Dr. Mudd; a former prisoner of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Entrance to the dungeon of Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson is an unfinished costal fortress. Construction began in 1847. It's the largest masonry structure in the western hemisphere.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. A retired canon atop Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. The sun setting upon Dry Tortugas National Park. Civilization is over 50 miles away via air or water.

Dry Tortugas National Park, Florida, United States. Until tomorrow... Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Fort Jefferson and it's moat wall at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. "Good Day, Sun Shine..." Sunrise at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. This modern housing is for the park rangers and other maintenance staff at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Night photos of Fort Jefferson at Dry Tortugas National Park. The moon and light house added some nice ambiance.

Dry Tortugas National Park, Florida, United States. The hermit crabs came out at night; crawling through the cracks in the rocks.

Dry Tortugas National Park, Florida, United States. Night time shot of the entrance to Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. A night shot of a light house off in the distance. This lighthouse is unmanned and sits upon an island all by it self.

Dry Tortugas National Park, Florida, United States. Home for the night. This campsite had an amazing view! A great site to toss up the tent for the evening.

Dry Tortugas National Park, Florida, United States. The view from the back yard of the campsite. This certainly doesn't hurt for a good night of camping.

Dry Tortugas National Park, Florida, United States. A seagull that hung out in the morning for a while.

Dry Tortugas National Park, Florida, United States. Fort Jefferson at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Dry Tortugas National Park

Dry Tortugas National Park, Florida, United States. Gorgeous view of the islands at Dry Tortugas National Park.

Dry Tortugas National Park, Florida, United States. Saying good bye to Dry Tortugas National Park and Fort Jefferson aboard the Yankee Freedom.

Dry Tortugas National Park, Florida, United States. Dry Tortugas National Park and Fort Jefferson.