Explore the White Desert

A 70-metre crater of natural gas that has burned since 1971 — camp beside the "Door to Hell" at night.

Camel trek to towering Erg Chebbi dunes.

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

Sheer desert escarpment near Riyadh.

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

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

Otherworldly landscape of limestone chimneys.

Young fissure volcano between spreading tectonic rifts.