This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Meet the bronze beloved pet to a family of famous peeing statues.

Cozy basement bar sports an inventory of over 2,000 beers.

Museum preserving torture methods from the past.

Abandoned railway line circling the city of Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The heads of two giant mythological water horses honor Scotland's horselord past.

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

360° views of the city plus five floors of optical illusions and hands-on science.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

A landscape decorated with enormous skull sculptures.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

This London plaque marks the spot where David Bowie's famous alien made his debut.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The largest of London's subterranean rivers and once a mad, bad center of London life.