Inside this Krakow church, an explosion of psychedelic color.

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

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

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.

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

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

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

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

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

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

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

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

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

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

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

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

A memorial to the beloved brown bear that served in the Polish army during World War II.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

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.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.