A tourist holds her arms up to feel the wind coming up from the Grand Canyon on the Skywalk at Grand Canyon West on the Hualapai Indian Reservation in Arizona, March 20, 2007. She is wearing cloth booties to keep dirt off of the glass walkway. Former astronaut Buzz Aldrin took the ceremonial first step on Tuesday onto a glass-bottomed walkway overhanging the Grand Canyon that backers hope will lure tourists to the remote west rim. A private developer from Las Vegas built the $40 million horseshoe-shaped walkway. REUTERS/Jeff Topping (UNITED STATES) Also see image: GM1DUYOHTYAA