In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

Amsterdam's Red Light District leaves little to the imagination.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

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

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

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

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

This extensive collection covers thousands of years of Polish military history.

Inside this Krakow church, an explosion of psychedelic color.

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

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

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

This grubby wall is said to be one of the Earth's esoteric energy centers.

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

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

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

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

This imposing 20th-century castle was abandoned before it was ever completed.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.