Location: North Kingston, Rhode Island

Price: $6,450,000

The lighthouse portion of this seaside mansion might look like a gimmicky addition to a '90s construction, but, in fact, that's the Popular Point Lighthouse, America's oldest wooden lighthouse. Decommissioned in 1894, it's been expanded over the ensuing years into a four-bed, five-bath, 4,500-square-foot home. Back in 1894, the navigational beacon sold for $4,000 -- that's $100,000 in today's dollars -- but has appreciated significantly since then. The owners are asking $6,450,000 for the 1.66-acre site and the historic house.

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