Cape Cod Highland Lighthouse in Truro. Originally built in 1797, the Highland Lighthouse is the tallest on the Cape. It was reconstructed in 1857, automated in 1986 and moved back from an eroding cliff in 1996. Visitors to the still-functioning Coast Guard light can climb to the tower and the observation deck that sits 120 feet above the ocean. From this point, there's nothing between you and Portugal across the Atlantic.