Visit the Ardoukoba volcano

Otherworldly landscape of limestone chimneys.

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

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

Forested highlands rising green out of the Djiboutian desert.

Bubbling grey cones on the Caspian steppe — half the world’s mud volcanoes are here.

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

Sheer desert escarpment near Riyadh.

High-altitude geyser field steaming at dawn, 4,300 m up in the Andes.