The Mission Inn, now known as The Mission Inn Hotel & Spa, is a historic landmark hotel in downtown Riverside, California. Although a composite of many architectural styles, it is generally considered the largest Mission Revival Style building in the United States. Mission Inn Hotel & Spa is a member of Historic Hotels of America, the official program of the National Trust for Historic Preservation. The owners are Duane and Kelly Roberts. The latter serves as vice chairman and chief operating officer. History The property began as a quaint adobe boarding house called The Glenwood Cottage, built by engineer/surveyor Christopher Columbus Miller and on November 22, 1876, the Millers took their first paying guest. In February 1880, Miller's son Frank Augustus Miller purchased the hotel and land from his father. It became into a full-service hotel in the early 1900s due to California's economic citrus boom and warm weather, attracting wealthy travelers and investors from East Coast and Europe. In 1902, Frank changed the name to the "Glenwood Mission Inn" and started building, in a variety of styles, until he died in 1935. Miller's vision for the eclectic structure was drawn from many historical design periods, revivals, influences, and styles. Some are Spanish Gothic architecture, Mission Revival Style architecture, Moorish Revival architecture, Spanish Colonial style architecture, Spanish Colonial Revival Style architecture, Renaissance Revival architecture, and Mediterranean Revival Style architecture. With one section over another, addition upon addition, the result is a complicated and intricately built structure. It contains narrow passageways, exterior arcades, a medieval-style clock, a five-story rotunda, numerous patios and windows, castle towers, minarets, a Cloister Wing (with catacombs), flying buttresses, Mediterranean domes and a pedestrian sky bridge among many other features. During the 30-year construction period, Miller traveled the world, collecting treasures to bring back to the hotel for display. The St. Francis Chapel houses four large, stained-glass windows and two original mosaics by Louis Comfort Tiffany in 1906. The windows were salvaged from the Madison Square Presbyterian Church and the chapel purpose built to house them. The Mexican-Baroque styled "Rayas Altar" is 25 feet tall by 16 feet across, carved from cedar and completely covered in gold leaf. For his "Garden of Bells," Miller collected over 800 bells, including one dating from the year 1247 described as the "oldest bell in Christendom." In 1932, Frank Miller opened the St. Francis Atrio. The "Famous Fliers' Wall", added by