The Pilgrim Monument in Provincetown, Massachusetts, was built between 1907 and 1910, to commemorate the first landfall of the Pilgrims in 1620, and the signing of the Mayflower Compact in Provincetown Harbor. This 252-foot-7.5-inch-tall campanile is the tallest all-granite structure in the United States, and is part of the Provincetown Historic District. In 1620, the Pilgrims spent five weeks exploring Cape Cod before they sailed to Plymouth, Massachusetts.