On this Polish road, an optical illusion makes cars seem to roll uphill.

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

Hundreds of notes give thanks to the patron saint of lost causes.

The first, and perhaps only, monument dedicated to Wikipedia.

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

A miniatures park with a model of Wolf's Lair as it looked during World War II.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

Special benches that play Chopin's music are scattered throughout his native city.

A tree planted by Marie Curie is treasured by the Radium institute that she set up.

An impressive monument to Poland's independence.

This bell stars in a tragic love tale and is said to make wishes come true.

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

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

The site of one of the largest prison escapes of World War II.

The relics are stored in a silver reliquary, where they can be seen through glass.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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

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

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

This towering statue of Jesus provided internet to the surrounding area.