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

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

Three million year old fossils are exposed for all to see on this Icelandic shore.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

A sulfuric martian landscape that looks far better than it smells.

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

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

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 winding, blood-red tunnel of hardened lava navigable by foot.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

The most powerful waterfall in all of Europe.

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

This modern monument to pagan belief looks like it was transported straight from ancient times.

Climb right into the heart of this colorful Iceland volcano.

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

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

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

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

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

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.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.