Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

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

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

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

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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

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

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

In a small churchyard in Dingolfing, Germany the quaint Schusterkapelle is there to remind you of your imminent mortality.

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.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

A tribute to Ponce de Leon's supposed quest for eternal youth.

An oddities shop that dabbles in the deathly and beautiful.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A nostalgic bibliographic gem.