Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

One of only two places in the world where two rivers cross each other without the waters mixing.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

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

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

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.

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

An underground city of salt.

Ancient snack bar of the Roman Empire re-opened.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

This medieval city gate is now a blend of the past and the modern world.

The world's newest astronomical clock is also its most accurate.

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

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

This antique thermometer honors the creator of the first universal temperature scale.

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

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

This Communist-era residential block is one of the longest residential building in Europe.

A haunting deserted hotel is a favorite with artists and photographers.

The site of the first battle of World War II.