National Geographic : 1963 Jan
fortress lay forgotten until its discovery by Hiram Bingham, who led three National Geographic Society-Yale University expeditions to the site in A UAI MOMt BY EDWARDS PARK, NATIONALGEOGRAPHIC STAFF U N.GAS. 1912, '14, '15. Time fails to dim the splendor of the penthouse city. Temple with sundial surmounts the stairstep pyramid. Terraces supported gardens.