GRAND CANYON, AZ - MARCH 20: The sun sets on the evening of the first official walk on the Skywalk, billed as the first-ever cantilever-shaped glass walkway extending 70 feet from the western Grand Canyon's rim more than 4,000 feet above the Colorado River, on March 20, 2007 on the Hualapai Reservation at Grand Canyon, Arizona. The building of the Skywalk on Hualapai Indian tribal land 90 miles downstream from Grand Canyon National Park has stirred controversy with some tribal elders and environmentalists who have condemned it as a desecration of a sacred American landscape. The $40 million glass and steel platform will open to the public on March 28 when visitors will be allowed to take the lofty walk at a cost of $25 per person plus the cost of a GrandCanyon West entrance package, a total of about $75. (Photo by David McNew/Getty Images)