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

An Austrian house of bones filled with hundreds of intricately painted skulls.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

These two 15th-century metal rods allowed people to check if they were swindled or not.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Ride a dragon train into a world of dwarves.

The beautiful baroque library of the Hapsburg empire.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

This cemetery features modernist statues as strange as its name.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.