An empty bookshelf commemorates the books which were lost during the infamous event

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A lush oasis full of vibrant plants and striking geometric displays.

These small, triangular, colorful houses are a staple of Madeira Island.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

Eat the ultimate iteration of Portugal's most beloved pastry.

A maze of underground warehouses and cellars underneath one of Poland's most historic cities

For 200 years, people have flocked to this Polish town to experience the healing powers of salt.

The rusting hulk of a Soviet warship sits on a Polish beach.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

This 13th century Gothic brick castle is the largest in the world by surface area.

These massive moving sand dunes have swallowed an entire village and are still on the run.

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

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

Naturally formed rock city in Poland.

An underground city of salt.

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

Beautiful portraits of the artist's children and his amazing stained glass windows in the Art Nouveau style.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.