At 20,320' (6190m) Alaska's Denali, formerly known as Mt. McKinley, is the highest peak in North America. It has been summited by climbers as young as 11 years old and as old as 78. A trip to Denali is often preceded by a "training climb" on 14,411' (4392m) Mt. Rainier which has its own difficulties. Rainier is the highest mountain in Washington state and its proximity to the Pacific Coast makes it the perfect training ground to prepare for higher mountains.