Wood End Lighthouse. Entrance to Provincetown Harbor, Provincetown, MA. A 38-foot brick tower -- originally painted brown -- was erected, and the light went into service on November 20, 1872. A fifth-order Fresnel lens exhibited a red flash every 15 seconds, 45 feet above the sea. A keeper's dwelling was built about 50 feet northeast of the lighthouse. The lighthouse, still an active aid to navigation, is also viewable from some of the excursion boats out of Provincetown.