A church dedicated to the Mexican skeleton saint.

Extraordinary sculpture garden created by an eccentric English poet.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

The winter home of millions of migrating monarch butterflies.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

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

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

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

Mexico's astounding mummy museum with "the world's smallest mummy."

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

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

The population of Southeast Asian primates was introduced to Mexico in the 1970s.