In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Along this wire fence, travelers have been leaving a particular memento since 2012.

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

Three columns of volcanic rock shoot out of the ocean.

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

This elegant arc of a waterfall marks a religious turning point.

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

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

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

A stunning Victorian abbey and walled garden on a lakefront.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Certain traditions prevail on the least-visited island of the Aran Islands.

Huge standing stones mark a site of megalithic mystery.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Go surfing on this urban wave, "hacked" by local surfers.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.