A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

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

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This tiny German village has staked claim to being the center of the union following Brexit.

This cheeky statue of a man defecating gold coins graces the facade of a medieval guildhall.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

A strange rock formation with numerous legends trying to explain it.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A famed artist's inspiring work of peace and tolerance.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

This tremendous timepiece was once the largest cuckoo clock in the world.

Model Trains and Much More in Hamburg.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.