Visit Chamarel's Seven Coloured Earths

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

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

One of the largest green canyons on Earth, seen from God’s Window and the Three Rondavels viewpoints.

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.

Six sapphire lakes held by natural travertine dams in the Hindu Kush — Afghanistan’s first national park.

Karst caves stuffed with Buddhas amid sugarloaf mountains.