Find great value on US Airways flights from PDX to PHX when you book with CheapOair! Phoenix is the sixth largest city in the United States and the anchor of the Phoenix Metropolitan area. From watching the bizarre desert plants from around the world at the Desert Botanical Garden to hiking at the South Mountain Park, Phoenix is home to multitude of travel worthy attractions. It is the most populous city in the American Southwest. There is so much to see and explore in Phoenix. Witness the most interesting perspectives on the events and lifestyles of Arizona at the Arizona Capital Museum. Those having love for precious metals, should definitely check out the Arizona Mining and Mineral Museum. It houses richly colored minerals.