Denver: High And Mighty

Twenty years ago, downtown emptied out after dark, but since then the residential population has grown by 66 percent, and the area has evolved into a 24-hour community. Many residents live in high-priced lofts in the Lower Downtown National Historic District — or LoDo — which contains one of the nation's largest collections of 19th century commercial buildings. People from all over the city and surrounding suburbs flock to LoDo's restaurants, bars, and sports facilities.