The Atacama Desert of Northern Chile is the driest place on earth. There are some places in the Atacama where it has not rained in over 400 years. These are the tops of mud dwellings and storage huts that were last in use about 2500 years ago when the river that used to run by them dried up. Recently excavated, the archeologists determined the best way to preserve them was to allow the desert wind to recover them in sand. Now they dig away only enough sand for the original wall tops to be visible to visitors. A replica of what the huts looked like has been constructed, and is visible in the upper left.