Just when you thought all private islands were covered in coconut groves and soft white beaches (not that we don't love those!), along comes Petra Island, an 11-acre (4.5-hectare) parcel with a big history in Lake Mahopac, N.Y.
There are currently two homes on Petra Island. The smaller of the two is a 1,200-square-foot cottage designed and built by Frank Lloyd Wright in 1950 [source: Private Islands Online]. But the showpiece is a 5,000-square-foot residence built several decades later based on Wright's architectural renderings [source: Colman]. While the larger home wasn't built until long after Wright's death, its design followed his original plan. The result looks very much like a Wright creation and features wide open expanses of stone, concrete and mahogany wood [source: Colman].
Petra Island was on the market as of February 2011, but the asking price wasn't publicly available. Current owner Joseph Masarro bought the island and the cottage in 1991 for a reported $700,000 and completed construction of the main residence in 2007 [source: Mann].