This abandoned but well-preserved Prussian fortress sits abandoned in a Polish forest near the German border.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

The center of this Polish border town was so thoroughly wiped out in World War II that only the foundations remain.

This lakeside bunker complex in Mamerki, Poland, housed the Supreme Military Command of Nazi Germany during World War II.

This wooden mosque is one of the few remnants of medieval Poland's Muslim Tatar community in this deeply Catholic country.

This unique museum focuses on the Siege of Sarajevo through children's eyes.

An extensive network of secret tunnels was created for the Nazi project "Riese."

The last original stone marking the interwar border between Germany and Poland sits in this unassuming village park.

Each spring, residents of this Czech town hoist a 'slain' metal dragon onto the city hall to commemorate a local medieval legend

This elaborate stone bridge over the Neisse river has sat in pieces since 1945.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

Before he was forced to flee the country under Nazi rule, Albert Einstein spent his summers in this custom-built lakeside house near Berlin.

This village in Bohemian Switzerland hosts more than 300 wood carvings inspired by fairytales, folklore, and other oddities, as well as a series of Communist-era tanks

These tiny cabins on a cableway have been carrying visitors at a Baltic resort down to the beach since 1912.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

This fortress was designed to prevent a Nazi invasion but was never used.

The room where the famous commander of the Catholic forces was murdered by Irish assassins during the Thirty Years' War has been reconstructed with many of his original possessions.

Rent a barrel for a personal view of where the Baltic Sea meets the Gulf of Riga.

The Latvian city of Ventspils is filled with dozens of cow statues showcasing unique themes.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Named after the German word for "a longingness to travel," this park brings together thousands of city and street signs from around the world.