The yawning maw of this pagan visage is said to bite off the hands of liars.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

This series of Scottish caves has no clear purpose other than baffling historians.

Monasteries on rock pillars, once accessible only by frayed ropes.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A floating cat sanctuary on an Amsterdam canal.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A self-built castle made by a mysterious man.

Ruins of a German Castle on top of a towering stone pillar.

An unusual round church in London with a Templar past.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

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

Medicinal spa created with the discharge from a geothermal energy plant.

Abandoned railway line circling the city of Paris.