Roman ruins top white travertine terraces formed by ancient hot springs.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This famous archeological mystery may be an ancient example of movable type.

This famous city eluded concrete detection until the early 2000's.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's national museum of scientific and industrial instruments.

The celebrated eyesore created by starry-eyed sweethearts.

A cluttered and astounding collection of antiquities and curiosities.

Repository for more than 22 million pickled specimens.

Eighty million natural history specimens call this gargantuan museum home.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.