Perhaps one of the ‘classic’ American cities, Philadelphia is known both within the United States and worldwide for its important role in the nation’s history.
The answer to a mystery that has puzzled scientists for decades lies in this dry lakebed, which is speckled with rocks that seem to move by themselves.
Experience the ever-changing hues of this ancient landscape. Soaring spires of weathered rock and desert plains capture the essence of the American Southwest.