A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Two stunning 17th-century libraries and a cabinet of curiosities.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Abandoned railway line circling the city of Paris.

The fairy tale castle of the "fairy-tale king."

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A crumbling hospital from the 1850s on Roosevelt Island.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.