Sankaty Head Lighthouse, Nantucket

Perched on Nantucket's eastern bluff, Sankaty Head Lighthouse has guided ships along the island's coast since the mid-19th century. Erosion threatened to claim it entirely — so in 2007, the brick tower was moved inland to protect it from the collapsing shoreline. Listed on the National Register of Historic Places, the grounds are open year-round. The lighthouse itself stays closed, but the views across Nantucket's moors and out toward the Atlantic make the trip worth it.