A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Structure built from the skulls of vanquished foes.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

This last stalwart of the now-forgotten feminist restaurant movement has been serving food in an activist atmosphere since 1977.

A cheeky architectural easter egg.

A New Hampshire grave with a grudge.

The suspected burial mound of legendary Viking Björn Ironside.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.