Visit the Edge of the World

Wind-carved chalk mushrooms and icebergs of rock glowing at sunset — camp overnight under the Sahara stars.

Monasteries atop soaring rock pillars.

Rhyolite mountains streaked orange, green and pink, with a natural hot river to soak in after the walk — the start of the Laugavegur trail.

Climb 740 steps up the El Penol monolith for views over a maze of turquoise reservoir lakes.

Slot canyon on Navajo land near Page, Arizona, carved into swirling sandstone by flash floods.

Mineral springs that have petrified into white waterfalls of stone above the Oaxaca valleys, with cliff-edge pools you can swim in.

Wind-carved kalut ridges in one of the hottest places ever measured on Earth.

Neon sulphur pools, salt flats 125 m below sea level and the Erta Ale lava lake — the hottest inhabited place on Earth.