Built in the mid-1930's by the Civilian Conservation Corps, this 45' stone tower with live-in top floor observatory served as a state lookout until the mid-1960's when the number of tourists interfered with the firewatcher's duties. This prompted the construction of Little Summit Lookout 1.5 miles to the south as a replacement in 1966. Constitution's stone fortress continues to be a popular tourist destination in the San Juan Islands and is listed on the National Historic Lookout Register.