Mark Trahanovsky likes the way the world looks from the top floor of some very tall buildings. He's been to the top of the Sears Tower in Chicago a few times, and is a big fan of the 63-floor Aon Center in Los Angeles. The thing is, when Trahanovsky visits skyscrapers across the country, the 51-year-old Yorba Linda resident only believes in taking the elevator down. Trahanovsky competes in the growing sport of stair climbing. In fact, he is ranked no. 27, among male stair climbers in the world and climbed the Willis (Sears) Tower in 16:46 minutes in 2008....