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

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

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

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

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

An underground city of salt.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.

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

An abstract and eyecatching clock/fountain is the centerpiece of this little-known German city.

This 13th century Gothic brick castle is the largest in the world by surface area.

The site of the first battle of World War II.

This Communist-era residential block is one of the longest residential building in Europe.

Take a hike to this remote, scenic tea stop in the Canadian Rockies.

The only road through the heart of Glacier National Park.

Spectacular views await visitors to this lake.

Blackfoot petroglyphs of southern Alberta which date back as far as 7000 B.C.

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

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

Inside this Krakow church, an explosion of psychedelic color.

Real bones which are said to have belonged to a Polish dragon.

This grubby wall is said to be one of the Earth's esoteric energy centers.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian Badlands.