Situated on a hilltop adjacent to the Arizona Biltmore, this elegant mansion was built by chewing-gum magnate William Wrigley, Jr., between 1929 and 1931 as a present for his wife, Ada. Designed with Italianate styling, the mansion has so many levels and red-tile roofs that it looks like an entire village. The mansion is now a National Historic Landmark, with the interior restored to its original elegance. Tours of the mansion are offered 5 days a week and offer a fascinating glimpse into the lives of the Wrigleys. Tour reservations are required.