​Would you swim at the top of this huge waterfall?

4 books to inspire your next hike

Letterboxing? It's treasure hunting for nature fans

Rock's 'humming' can reveal how healthy it is

Which countries have the most trees?

How a year on the road saved one woman's life

Hidden chain of volcanoes found in Australia

Devon Island is as close to Mars as you may get

10 must-see treasures outside of Yellowstone

Did we solve the mystery of the 'sailing stones'?

Mount Roraima: 'A remote island in the sky'

How do you clean up a contaminated river?

Freaks of Nature

Stories You Won't Believe