Legendary architect Frank Lloyd Wright began building a dream home on his heart shaped island of Petra north of New York City before his death, but it was ultimately finished by Joe Massaroi and architect Thomas Heinz. Completed in 2008, the 11-acre island is home to a 5,000 sq. ft. main residence and a 1,200 sq. ft. guest cottage. It is now on the market for $19.9 million.