Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

This incredibly diverse research station is one of the largest tropical botanical gardens in the world.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.

Remote Honduran Islands with a colorful history.

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

The legend associated with these ruins understates the splendor of the mansion that once stood here.

Cavernous opening completely encased in Karst limestone.

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

This popular cave pool is truly magical, despite the crowds.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

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

The only castle in North America to ever house European sovereigns.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

This fantastical house shaped like a seashell brings aquatic design to architecture.

Twelve natural mummies are displayed in the crypt of this former monastery school.

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

The famous artist couple lived and worked here, in two different houses separated by a bridge.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

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.

Frida Kahlo's childhood home, now a museum of her life and works.

These azure waters were thought to lead to the Mayan Underworld.