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

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Rising from the sea like a stone monster.

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.

This Denmark theme park is part family attraction, part experimental archaeology project.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This replica Viking village was created for a film that was never shot and is now open to visitors.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

The ruins of a medieval monastery named after a type of tree.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

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

Just another ancient, mysterious Irish stone circle.

Wander among the abandoned ruins of this once-powerful medieval town.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

Local legend says the remains of Father Christmas lie within the medieval grounds.

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