Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

This museum houses an imposing skeleton army comprised of creatures great and small.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

Hidden in the woods behind this English estate lies a Victorian pet cemetery.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This popular square's history as the former site of a church is right beneath your feet.

The preserved left hand of a saint once known as "the Pearl of York."

When the plague struck York, this stone was used to leave supplies for the sick.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

One of the shortest streets in York has an especially odd name.

Makers and sellers of the original and finest York Ghosts.

The little-known second castle that William the Conqueror built in York.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.