At least seven hues of blue and turquoise make this freshwater lagoon unique.

Inside this mountain lies several kilometers of breathtaking caves.

Beach instrument turned bed and breakfast.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A dark tunnel leads to a striking white crater that seems to be from another planet.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

A flooded Mexican cave that hides a river beneath the water.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

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

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

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

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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

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

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

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

A gargantuan crystal kingdom.

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

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

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