Alaska became a state in 1959, and the state capital is Juneau. As the largest state in the United States, Alaska is approximately one-fifth the size of the continental United States. The state is home to many of the tallest mountains in the United States. Denali, the tallest mountain in Alaska, is over 20,000 feet above sea level. Glaciers cover 5 percent of Alaska, and the state has more glaciers and ice fields than the rest of the world combined.