A visionary couple and an ever-growing army of volunteers work to return 2 million acres in South America back to nature.
The space agency provides pictures of enigmatic giant shapes that were first spotted in 2007.
See why the residents of Coober Pedy, often referred to as The Opal Capital of the World, choose to live underground in Australia's Outback.
A beautiful endangered bird was photographed for the first time ever, only to be killed later by researchers who hope to study it more.
When an animal takes a selfie, who owns the rights to it?
These places look alien, but they're actually on Earth.
Photographer Steve Axford captures amazing, sometimes eerie, views of mushrooms and other fungi.
This week: A special Earth Day planet pics looks at the world's largest desert, a massive iceberg on the move and a deep ocean dive where you can ride along.
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