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

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

The winter home of millions of migrating monarch butterflies.

A church dedicated to the Mexican skeleton saint.

A uniquely robust and historic look at Mexico's omnipresent dance with Death.

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

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

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

A gargantuan crystal kingdom.

The largest stone moai on Rapa Nui.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

This Peruvian bone silo lined with hanging human skeletons and hundreds of skulls is topped with a remarkable Michelangelo replica.

Lima’s Museum of Anthropology is lined with thousands of elongated human craniums.

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

A colorful Peruvian city of the dead.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A winding, blood-red tunnel of hardened lava navigable by foot.

An encyclopedic collection of mammal penises.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

On Japan's Tashirojima Island, cats are king.