PHOTOGRAPH BY PR NEWSWIRE, GRANDCANYONSKYWALKFACTS.COM, AP
PHOTOGRAPH BY MELISSA FARLOW, NATIONAL GEOGRAPHIC
PHOTOGRAPH BY ARND WIEGMANN, REUTERS/CORBIS
4. Suspended Platform at Iguazu Falls, Argentina and Brazil.
PHOTOGRAPH BY FRANS LANTING, CORBIS
PHOTOGRAPH BY NILS VIK
PHOTOGRAPH BY CHRISTIAN HANDL, IMAGEBROKER, CORBIS
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