Relive a Polish uprising via an enormous, century-old cyclorama.

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

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

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

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

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

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

An abandoned Jewish sanatorium is tucked within the woods of Poland.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

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

Boats must transform into railroad cars to navigate this Polish canal.

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

This imposing 20th-century castle was abandoned before it was ever completed.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

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

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

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

The world’s narrowest house makes for an awkward, four-foot-wide living space.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

Naturally formed rock city in Poland.

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

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

Warsaw's fantastically preserved gasworks...almost.

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