Lowell Observatory Lowell Observatory Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States. Lowell Observatory was established in 1894, placing it among the oldest observatories in the United States, and was designated a National Historic Landmark in 1965. In 2011, the Observatory was named one of "The World's 100 Most Important Places" by TIME. It was at the Lowell Observatory that the dwarf planet Pluto was discovered in 1930 by Clyde Tombaugh. The observatory was founded by astronomer Percival Lowell of Boston's Lowell family and is overseen by a sole trustee, a position historically handed down through the family. The
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