Lowell Observatory

Lowell Observatory is an astronomical observatory in Flagstaff, Arizona. Lowell Observatory is among the oldest observatories in the United States, and was designated a National Historic Landmark in 1965.
The Observatory's original 24-inch Alvan Clark Telescope is still in use today for public education. Lowell Observatory hosts 70,000 visitors per year who take guided daytime tours and view various wonders of the night sky through the Clark Telescope and other telescopes. It was founded in 1894 by astronomer Percival Lowell, and run for a time by his third cousin Guy Lowell of Boston's well-known Lowell family. The current trustee of Lowell Observatory is William Lowell Putnam, grandnephew of founder Percival Lowell and son of long-time trustee Roger Putnam.