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

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

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

A striking public sculpture representing the period of martial law in Communist Poland.

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

A statue honors the children who fought Nazis in Poland.

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

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

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

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

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

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

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

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".

A huge wooden clock that is so beautiful its creator was forcibly blinded.

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."

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

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

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.

Naturally formed rock city in Poland.

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.