A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

Abandoned ship reimagined as a street art canvas.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The stately remains of Llywelyn the Great's mighty fortress.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

On an island south of Iceland, a large volcanic rock formation resembles an elephant.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

This natural rock formation features seemingly unnatural vertical ridges that have been blamed on elves.

Climbing Iceland's highest peak on the rim of the Oræfajökull volcano.

An Icelandic island full of diving birds and legend.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

The summer tourists on these cliffs are thousands of seabirds.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

Three columns of volcanic rock shoot out of the ocean.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

A little-visited waterfall in an otherworldly landscape.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.