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

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.

The site of the first battle of World War II.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

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

The world's most active stratovolcano is almost always erupting.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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

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

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

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

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.

An abstract representation of weather in Sweden.

These airport hangars are now a bustling shopping center with only hints of its past still lingering.

A concrete mushroom that divided Stockholm residents for nearly a century.

A heated statue pays tribute to one of Sweden's great actresses.