The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

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

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.