The world's first motorway was used as a racetrack until the late 1990s.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An old department store turned Nazi prison turned artist commune.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

Hamburgers are intensely proud of their tunnel beneath the river.

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

Two monstrous faces loom over a village in Czechia.

Human figures and faces are carved into the sandstone surrounding this cave in Czechia.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This statue intended for children to enjoy became a minor political spat.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Created by a local artist, these quirky sculptures each have their own names and personalities.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

An architecturally unique lighthouse that had to be lifted up and moved to avoid falling in the sea.

Op-art architecture designed for happiness.