Cat art as far as the eye can see.

A public urinal so pretty, it was declared a national monument.

A secret door leads to this cozy dive that sells only “milk.”

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

A massive underwater sinkhole made famous by Jacques Cousteau.

Last stop before the top of the highest peak in the world.

This stunning mass of ice spans 121 square miles and is still growing.

This haunting ghost ship stands beached in the waters off the coast of the Falkland Islands.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

This uninhabited volcanic island is the most remote in the world.

Fire meets ice at the southernmost volcano on Earth.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

Natural time capsule containing an alien ecosystem.

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

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

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

This wrecked airplane has been sitting on a black sand beach since the 1970s.

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

The most powerful waterfall in all of Europe.

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

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

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

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