An open-air museum of 18th-century homes and churches transported from various villages in Southern Poland.

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

Hundreds of notes give thanks to the patron saint of lost causes.

A small granite monument marks where the borders of three countries meet.

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

A monument to Poland's famous alleged UFO abduction case.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

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

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

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

A tree planted by Marie Curie is treasured by the Radium institute that she set up.

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

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

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

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

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

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

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

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.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The giant metal fruit was once the symbol of a large farm.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.