Printed on back, top left corner:"The great open air amphitheater at the Park of the Red Rocks was opened in 1941. This great bowl seating 12,000 or more people is flanked on each side with huge red sandstone cliffs and the stage is at the foot of another great block of stone. These great rocks form natural sounding boards offering splendid acoustics as well as a marvelous setting." , Printing #:361