The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

It was once nicknamed "the most bombed hotel in Europe."

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

An important landmark in the history of algebraic logic.

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

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

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

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

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A haunting deserted hotel is a favorite with artists and photographers.

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

Museum dedicated to "the man who moved the Earth."

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

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

Atop this library is one of the most beautiful green spaces in Warsaw.

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

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

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