Rebecca Marshall Farnbach Casa Loma, the “house on the hill,” is the finest of the remaining historical residences in Temecula. The adobe structure was constructed for Mahlon Vail in 1926 on the hilltop in today’s Redhawk area. The property gave a 180-degree view of the valley below. The single-story Spanish-style home has 18-inch-thick walls that insulate it well against summer heat, redwood floors and hand-hewn rafters, and six fireplaces. Temecula granite lines the outdoor walkways and steps. The Vails had an airplane strip, a five-hole golf course, gardens, swimming pool, and a patio with a barbecue grill. It was perfect for entertaining.