Built in 1904 for local timber barons Michael and Timothy Riordan, this 13,000-square-foot, 40-room mansion—Arizona’s finest example of an Arts and Crafts–era building—is actually two houses connected by a large central hall. Each brother and his family occupied half of the house (the rooflines were constructed differently so visitors could tell the two sides apart). Its exterior is faced with log slabs to look like a giant log cabin; inside, mission-style furnishings and touches of Art Nouveau styling make it clear that this family kept up with the fashions of their time. The west wing holds displays on, among other things, Stickley furniture. Guided tours provide a glimpse into the lives of two of Flagstaff’s most influential pioneers. Incidentally, the Riordan Mansion was designed by Charles Whittlesey, the creator of Grand Canyon’s El Tovar Hotel.