The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A hidden beach at the end of a tunnel of mangrove trees.

The futuristic test model of an iconoclastic visionary who wanted to redesign the world.

Stay in a room with a view... of the bottom of the ocean.

In paradise, feral pigs have claimed an island all to themselves.

They squeal, they nosh, they look like predators.

One of the deepest blue holes in the world.

An underwater road considered a possible Atlantis location.

Impressive sink holes fill this untouched old-growth forest in the Bahamas.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

This protected reserve is home to a rare and beautiful species of flower.

View rare birds and interact with lemurs at this nonprofit run entirely by volunteers.

This picturesque ghost town is located on the banks of the Suwannee River.

Where manatees are the snowbird vacationers in these balmy Florida springs.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

One person's lost luggage is another person's treasure.

148 feet long and in the middle of a verdant forest.

A Prada store in the West Texas desert that is never open for business.

A spring-fed pool so deep it's used for scuba diving as well as swimming.