Percival Lowell Milan Observatory. In 1894 Lowell chose Flagstaff, Arizona Territory, as the home of his new observatory. At an altitude of over , with few cloudy nights, and far from city lights, Flagstaff was an excellent site for astronomical observations. This marked the first time an observatory had been deliberately located in a remote, elevated place for optimal seeing. For the next fifteen years he studied Mars extensively, and made intricate drawings of the surface markings as he perceived them. Lowell published his views in three books: "Mars" (1895), "Mars and Its Canals" (1906), and "Mars As the Abode of Life"
Allen House (Lowell, Massachusetts) early 1860s as the mansion house of Rollin White, who invented a type of rear-loading revolver. White worked for Samuel Colt in Hartford, Connecticut for many years before moving to Lowell and establishing his own firearms company, later the Lowell Arms Company. The house was later the home of Charles Herbert Allen, a politician prominent in state politics and the first civilian U.S. governor of Puerto Rico. Allen House (Lowell, Massachusetts) Allen House stands on the UMass Lowell South Campus. It is set on a rise above the Merrimack River, of which it has commanding views. It is an irregularly