A lake at the bottom of the ocean.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

Psychedelic murals coat the inside of a nondescript research library.

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

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

The winter home of millions of migrating monarch butterflies.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

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

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

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

A museum in the former home of Marxist revolutionary Leon Trotsky.

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

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

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.

Extraordinary sculpture garden created by an eccentric English poet.

Part bookstore, part café, and part forest.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

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

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

66,000 pieces of art, donated by one of the world's richest men.