This fantastical waterfall is hidden in a cave located in a cracked cliff.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

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

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

German-style coffee and cake, just like Oma used to make it.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

Oddly enough, a pair of Wolfs funded the construction of this Little Red Riding Hood sculpture.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

A giant snail sculpture looking longingly at the German traffic museum.

The scars of World War II are preserved on its walls.

A small square plaque marks a failed assassination attempt that could have changed history.

A subterranean display of public art and architecture.

A stairway to heaven, or to nowhere at all.

The video game-themed street art first popped up in the French city.

The personal library of the founder of modern neurology is open to visitors.

A French artist's vague warning hangs over Belleville.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Former hunting lodge of a duke who was an avid collector of impressionist works.

This bridge was constructed from the rubble of the infamous Bastille.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

BDSM, 1930s Style.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.