Tourists climb a sand dune washed up against a sandstone escarpment. Warning

Tourists climb a sand dune washed up against a sandstone escarpment. WarningTourists climb a sand dune washed up against a sandstone escarpment. Wadi Rum, The Valley of the Moon, Jordan

A sand dredge works the ocean channel in Victoria

Volcanologists on a frozen plain monitor a volcano research sensor with a laptop computer

Mangrove forest tree roots submerge below the surface at high tide

At the height of the dry season mud cracks under the baking sun

Iranian tourists photograph protective gods known as Lamassu at the Gate of All Nations in Persepolis

South Western Uganda

An Inca site with stone wall terraces for growing agricultural crops by creating microclimates

as people object to their presence

Sunset casts a desert mountain ridge into silhouette

Saltwater Crocodiles regulate body temperature by opening their jaws

Innamincka Regional Reserve

A kelp forest and boulders line the shore of Hout Bay