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

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

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

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

Museum dedicated to "the man who moved the Earth."

Gliwice Radio Tower, likely the tallest wooden structure in the world.

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

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

An underground city of salt.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Naturally formed rock city in Poland.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A church of bones, decorated with 40,000 human skeletons.