This building has survived for more than a century and remains virtually untouched.

A collection of intricate sculptures so small they have to be seen through a microscope.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

The most playful of the life-sized statues that make up Singapore's "People of the River."

This jam-packed Singapore antique museum preserves the fading remnants of a uniquely mixed culture.

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

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

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

It's believed this golden brick is part of the legendary lost Aztec treasure.

This Aztec structure remained hidden until the demolition of a supermarket exposed the lost temple.

Diego Rivera hid various people and symbols in his first large-scale mural project.

The unique collection of gifts includes braids of human hair, a spoon, and a Virgin made of bread.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

You can release a young butterfly at this beautiful indoor garden.

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

A barbarous band of serpents guard the bases of these Aztec temples.

An airy Art Deco space devoted to the weird and wonderful folk art traditions of Mexico.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.