This poignant sculpture of a gnarled weapon is a symbol of non-violence.

The single richest source of elemental discoveries in the world.

Stockholm's tiniest statue is of a small boy looking at the Moon.

This chimerical bridge/tunnel appears to dead end right into the sea.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

A cluster of headless, armless sculptures looms within a popular Polish park.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

Modern art commemorates one of the first military actions of World War II.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

A World War II torpedo launch station abandoned off the Polish coast.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

An underground city of salt.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.