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

One of the world's largest collections of medieval religious art.

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

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

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

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

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.

A statue honors the children who fought Nazis in Poland.

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.

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.

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.

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

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The site of the first battle of World War II.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Countless stories attempt to explain Poland's mysterious J-shaped trees.