The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

Experience what life was like in Ireland during the Viking and medieval ages.

The modern birthplace of Irish freedom.

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

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A hugely vast Irish landscape of barren rock that stretches for miles.

A statue dedicated to the antihero of the Nibelung legend.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

A Faraday Cage protects cars from a nearby high-power transmitter.

It's said the devil used this mushroom rock as a table for a late-night meal.

The last bastion of Roman presence north of the Alps looms over a German town.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This 600-year-old home seems to defy physics.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The world’s first interactive human body museum also serves as a chair for a giant orange man.

The grave of the famous painter is marked by a simple stone in the ground.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A beer pipeline runs beneath Bruges.