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.

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

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

Walk in the footsteps of the gods and straddle two tectonic plates.

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

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

What once sat in the world’s spotlight is today a largely disused ghost complex.

Large collection from the 3rd millennium BCE.

This famous archeological mystery may be an ancient example of movable type.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Giant marble phalluses on the sacred island of antiquity.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Fantastic views and thousands of love locks.

This futuristic German television spire is actually the world's largest digital clock.

A century-old shot ball factory tower is open to the public once a year.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.