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

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

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

This beautifully deceptive waterfall is something far different from what it appears to be.

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

The winter home of millions of migrating monarch butterflies.

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

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

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

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.

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

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

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

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

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

Part bookstore, part café, and part forest.

Extraordinary sculpture garden created by an eccentric English poet.

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

The 18th-century home was disassembled into 253 cases and brought all the way from the other side of the world.

One of the oldest theaters in Australia, it's also said to be haunted by a performer who died on stage.

You'll find the little birds tucked within the rocks of this Australian beach.

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

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