The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

Mile-long cave system near Great Smoky Mountains.

Mountain where Jesus was first tempted by the Devil.

Unusual rock formations eroded into a landscape of stone beasts.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

An emerald-green grotto just a short trip from Austin.

Myanmar's Mount Olympus atop a 2,500-foot volcanic plug.

These strikingly barren, rolling red hills were caused by bad farming practices.

Curious crater remnants in the middle of the Australian outback.

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

Landscape of bizarrely shaped desert mountains and innumerable rock carvings.

Roman ruins, natural methane fires and a lovely beach.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

When ecosystems collide in the arid Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A unique beach made of a myriad of multi-sized pebbles.

A remarkable geological formation resembling a forest made of stone.

Mysterious hillside with a continuously burning natural fire.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A face emerges from the landscape when seen from the air.