A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

An abandoned water sports stadium that has become a haven for graffiti and decay.

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

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

A bronze sculpture of Lenin’s likeness outside Havana surrounded by 12 human figures in solidarity with the Bolshevik Revolution.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A series of five defunct panopticon prisons in Cuba.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

An enormous, 30-story-deep hole in the middle of Guatemala City.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.