A cheeky architectural easter egg.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

France's most famous cemetery, with some of its most curious tombs.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

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

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

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

How did a French journalist’s grave become the sexiest statue in the cemetery?

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

Largest lake in Great Britain measured by surface area.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

Protecting the dead from opportunistic body snatchers.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Home to three historic ships from the age of Vikings.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This former insane asylum now holds a pathological anatomy museum.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.