This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.

This rare archive of original recordings and photos uncovers the early days of hip hop culture.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

Less a museum than a bizarre fantasy world created by artists and engineers.

After years of being casually peed on by humans, this tree is peeing back.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

An enormous, inside-out glass globe built in 1935.

Red frames showcase remnants of one of New York's original subway stations.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

In Paris, Texas they have their own Eiffel Tower, it just has a cowboy hat on it.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This innocent-looking townhome is actually a subway exit.