This labyrinthine resting place of Black American leaders has been reclaimed by nature.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

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

The only castle in North America to ever house European sovereigns.

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

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

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

Twelve natural mummies are displayed in the crypt of this former monastery school.

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

A church dedicated to the Mexican skeleton saint.

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

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The final resting place for the remains of 143 Habsburg royalty.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Within this lovely Richmond cemetery lie the remains of famous Virginians and some of Edgar Allan Poe's most beloved family and friends.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

Real bones which are said to have belonged to a Polish dragon.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

The place where World War I began.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Oriental bazaar in the heart of Sarajevo.