A sweet symbol marks the place where torturous executions were once carried out.

A book bound in the skin of an infamous criminal, along with countless other specimens.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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

An incredibly well-preserved piece of ninth-century Viking poop.

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

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

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

This network of narrow, medieval passages has the most delightful name.

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

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

A perfectly running 230-year-old silver automaton and music box.

An iconic waterwheel in the Pennine Hills marks the location of one of Britain’s most profitable lead mines.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

Huge winged monument in the United Kingdom.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

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

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