A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

The majority of the highest mountain in Poland is actually located in a different country.

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 oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

A World War II torpedo launch station abandoned off the Polish coast.

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

A peculiar family mausoleum built by a German nobleman captivated by the occult.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

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

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

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

This man-made mound monument was built out of soil from all across the Polish empire.

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.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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

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

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