This grand beaux-arts church was the nation's first basilica, taking 20 years to complete. Built during the tenure of Archbishop John Ireland, the enormous white marble building is a marvel to behold. It is 120 feet wide by 278 feet long supporting 133-foot twin towers in the front. One of the towers houses a 3000-pound bell that can be heard for miles around. Over the altar, an ornate dome rises 250 feet and the 56 rank pipe organ echoes throughout. Guided tours are offered every Sunday morning.