An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Flamboyant architecture from the turn of 20th century.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A 11-foot former president stands on a Kosovo street that also bears his name.

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

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

The modern birthplace of Irish freedom.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

This beautiful, historic church looks like something out of a simpler past.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stunning concert hall has become a symbol of Iceland's national recovery.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

An abandoned Byzantine fortress and notorious prison.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

A museum glorifying the life of Stalin, located in the city of his birth.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.