In Kolmanskop, a ghost town in Namibia's Namib Desert, sand has drifted into abandoned buildings for decades, reclaiming the rooms inside.

A centuries-old camel thorn tree, preserved by Deadvlei's dry clay pan, stands as an organic sculpture against Namibia's reddish dunes.

In New Mexico's White Sands National Park, a lone woman stands among gypsum dunes that seem to roll like waves toward the San Andres Mountains.

From a hot air balloon over the northern Serengeti, the Mara River leads past an acacia tree to another balloon drifting ahead on an early morning flight.

After landing in Namibia's Kalahari Desert, the ground crew steadies a hot air balloon. An everyday task that looks as if they might be trying to catch a cloud.