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

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

A heavily politicized roundabout discussing the state of a heavily politicized country.

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

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

This bell stars in a tragic love tale and is said to make wishes come true.

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

A statue honors the children who fought Nazis in Poland.

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

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

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

The pile of books behind the dignified writer gave the statue a most undignified nickname.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

These lights mark the area of Rotterdam that was bombed and burned in 1940.

A floating cat sanctuary on an Amsterdam canal.

When you're a great Russian Tsar, even your vomit gets a statue.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Model Trains and Much More in Hamburg.

This handsomely carved wooden church is more than 800 years old.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.