National Geographic : 1957 Apr
© National Geographic Society 4 Stone 42 Feet Thick Hangs in Mid-air Author and companions unfurl the National Geo graphic Society flag. Their footing was tricky, a blustery wind was blowing, and the 33-foot-wide platform felt none too secure. + Watery Mirror Inverts the Arch Bridge Creek, architect of the span, dries completely every summer. This shallow catchment in the creek bed did not linger long in the blistering sun. A cool spring near by always stays fresh.