An ice field known for harboring an infamous Martian meteorite turned out to contain the oldest air on Earth.

Scientists use one of the saltiest bodies of water on Earth as a terrestrial base for studying water on Mars.

Natural time capsule containing an alien ecosystem.

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

Nimrod Polar Expedition base, and home to hundred-year-old frozen whisky.

These giant volcano sponges in Antarctica are thought to be the world's oldest living animal, at 15,000 years old.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

Fire meets ice at the southernmost volcano on Earth.

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

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

Ice roads, deep holes and 3,500 pounds of diamonds.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

The world's largest dark sky preserve is a Canadian park established to preserve the country's last wood bison.

These oldest of these "embroidered stones" were carved 4,000 years ago in a high mountain valley.

A tiny, picturesque island, where cows and wild horses wander around the houses.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

An abandoned amusement park hints at the twisted history of the Newfoundland Railway.

A tiny, remote island packed with wonders both natural and geeky.

Eurasia's most difficult place to hang out, and farthest point from sea access.

Three legendary, living albino buffalo roaming their pastures for all to see.

This underground power plant looks more like a super-villian's lair than a public work.

Roadside collection of 65,000 signs.

The half-mile long structure is so impressive, it even shows up on satellite images.