Stay in a room with a view... of the bottom of the ocean.

Houses are tucked between, on, and underneath giant boulders.

An obscure waterfall that looks like something out of a fantasy novel.

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

An eccentric inventor's castle home with its own indoor weather system.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

A subterranean shelter remains intact under a busy Paris railway station.

This home is decked out like a psychedelic explosion of colors and bowling balls.

A fiery crater has been burning in the Karakum Desert since 1971.

France's national museum of scientific and industrial instruments.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

An underwater city for the dead.

Museum preserving torture methods from the past.

Sniff the Titan Arum's rotting flesh.

The most visited, and possibly most controversial, museum in Germany.

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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