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

A cluster of headless, armless sculptures looms within a popular Polish park.

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.

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

This towering statue of Jesus provided internet to the surrounding area.

On this Polish road, an optical illusion makes cars seem to roll uphill.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This extensive collection covers thousands of years of Polish military history.

The site of one of the largest prison escapes of World War II.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

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

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

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

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

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

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

What was once an underground Nazi city is now Europe's largest bat reserve.

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

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

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

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

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

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.