It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The unusual stilted beacon is the town's only active lighthouse.

Hidden beneath the streets of London is a secret subway that only carried mail.

The lavish, well-preserved home of a wealthy Baba Nyonya family is now a cultural museum.

A network of concealed passageways lies within a busy London Underground station.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

A hidden workshop for creating and restoring Papal mosaic masterpieces.

A golden egg-shaped sauna in the Arctic tundra.

Norway has built what may be the world's most beautiful public toilet.

A building so large that it has its own weather.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

Historic medieval fortified city in southwest France.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This 15th-century fortification was built to defend bunnies.

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).