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

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

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

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

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

A statue honors the children who fought Nazis in Poland.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

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."

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

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

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

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

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

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

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

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

Naturally formed rock city in Poland.

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

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 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

Warsaw's fantastically preserved gasworks...almost.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.