"Rally Week" - 150,000 bikes. A biker's tradition since 1940. Black Hill - Surgis, South Dakota.

Prairie dog town 

Prairie dogs communicate with each other by a variety of methods. The identification kiss is performed to show recognition and acceptance of the prairie dog in the territory.

Devil's Tower is an ancient volcano sculpted through time. The hard rock of the tower, the core of the volcano, was exposed as the softer sedimentary rock eroded away.