1. Cliff camping.
Gordon Wiltsie/National Geographic / Getty Images
2. Skywalking in the Alps.
Photo by Josef Stuefer – flickr
3. Portaledge camping at Yosemite.
Corey Rich / Getty Images
4. Climbing Redwoods.
MICHAEL NICHOLS/National Geographic Stock
5. Sitting on the Trolltunga rock in Norway. pics.deon.li
6. Jumping on the Trolltunga rock in Norway.
7. British climber John Roberts in South Africa.
Solent News / Rex / Rex USA
8. Ice climbing a frozen waterfall.
Keith Ladzinski/Barcroft Media /Landov
9. Extreme skiing at Grand Targhee, Wyoming. 33m.lista.cl
10. Tree camping in Germany.
11. Extreme kayaking at Victoria Falls.
Desre Tate/Barcroft Media /Landov
12. Blake Aldridge dives 29 metres from the rock monolith during the Red Bull Cliff Diving World Series in Portugal.
Handout / Getty Images
13. On the Edgewalk in Toronto.
14. A defying act by Eskil Rønningsbakken in Norway.
15. Alex Honnold at Yosemite.
16. Now imagine if you dropped your phone down there.
18. Trapeze paragliding.
19. Hanging out at the Sky Walk in Macau.
Bruce Peninsula National Park
Dan Dangler Bruce Peninsula National Park
20. Strange sport in the air, USA
21. In Ft. Tryon park by Jordan Matter
22. Base jumping in Yosemite...
JIMMY CHIN AND LYNSEY DYER / NAT GEO STOCK / CATERS
23. Bike trail on the Cliffs of Moher. hansrey.com
24. Driving down a sand dune in Lucky Bay, Australia.
2001 LimeWave – Anki Knutsson & Lars Andersson
25.China’s mt Huashan Death trail
26. Looking down from LION’S head
Photograph by trottin-the-globe.tumblr.com