An underground city of salt.

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

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

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

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

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

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

The last king of Poland was interred in this church nearly 200 years after his death.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

Special benches that play Chopin's music are scattered throughout his native city.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

A monument to the man who almost killed Hitler.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This natural marble cave is one of only five national monuments in Oregon.

The world's largest moose statue is located (where else?) in Canada.

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

The arch marks the beginning of the road for northbound travelers.