This German bone house contains the remains of some 20,000 souls.

A house of bones — but nobody is quite sure to whom they belong.

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

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

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

The mystery of the Putim Ossuary involves a tricorn hat.

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

Structure built from the skulls of vanquished foes.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

The earliest known map to show America, discovered by accident at a Paris bookshop.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The morbid items in this small and hidden museum are not for the weak stomached.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

An ancient Egyptian temple in the middle of Madrid, Spain.

This ancient rock painting is the oldest evidence of humans’ love affair with honey.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.