A short drive from downtown Portland, this 1794 lighthouse has been called one of the most picturesque in the nation. It's certainly one of the most-photographed; you'll possibly recognize it from advertisements, calendars, postcards, or posters. It was the first constructed in the new United States, commissioned by President George Washington; it began warning ships in 1791 and was manned by a keeper until 1989, when it was automated and the graceful keeper's house converted into a small museum focusing on the history of navigation. The lighthouse itself is still active, thus it's closed to the public. But you can stop by the museum, browse for lighthouse-themed gifts in a gift shop, and wander the lawns, cliffs, and other grounds of adjacent Fort Williams Park, which is a great place for a picnic, tossing around a Frisbee, strumming a guitar, or peering out to sea through the looking-glasses on the cliff top.