A statue honors the children who fought Nazis in Poland.

An underground city of salt.

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

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

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Where a Japanese government official issued transit visas to Jews fleeing from Nazi-occupied Poland.

This abandoned beacon is moving closer and closer to the sea.

Guests become prisoners on a visit to Latvian prison.

A black cat protests the City Guild in Riga's Old Town.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

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

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

A delightful museum entirely dedicated to the tiny homes of dolls.

This fairytale medieval church in Poland originally spent centuries in Norway.

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

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A memorial to the beloved brown bear that served in the Polish army during World War II.

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

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

3,000 market stands in five former Zeppelin hangars.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

Once a year, local students "clean" this statue with a champagne shower.