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

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.

These abandoned huts still hold the remains of an early 20th century Australian researcher's work.

The place of worship erected not once, but three times in one of the most desolate places on Earth.

A wooden hut from the Heroic Age of Antarctic Exploration.

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.

One of the most extreme deserts in the world, these snow-free valleys harbor life, despite the hostile environment.

Largest sub-glacial lake ever discovered.

Russian Orthodox church built on an Antarctic island.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

One of the world's southernmost bars.

Fire meets ice at the southernmost volcano on Earth.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

Natural time capsule containing an alien ecosystem.

The oldest known university in the world is in Fez, Morocco.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Traditional 11th-century outdoor tannery.

The other side is actually green.

Crumbling necropolis set high above Fez.

The skeletal white beams stand as a monument to religious dissent.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.