The site of the first battle of World War II.

A World War II torpedo launch station abandoned off the Polish coast.

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

This antique thermometer honors the creator of the first universal temperature scale.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

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

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

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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

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.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An alchemist's "magic door" stands in the middle of a Roman park.

The place where World War I began.

Bridge that died in war and was resurected.

An apparition of Virgin Mary in Herzegovina.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.