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

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

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

A collection of old neon signs from all over Poland line a secluded courtyard.

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

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

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

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

The traditional Polish croissant, folded 81 times into the shape of a horseshoe, is a legally protected cultural treat.

Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

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

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

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

A national collection of Communist-era musical posters.

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

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

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

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

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

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

A 20th-century picture show in 3-D.

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

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