6. Manalapan Megamansion — $195 million

This 16-acre estate in Lantana, Florida is simply dripping in opulence. It features nearly 63,000 square feet, a whopping 33 bedrooms, 47 bathrooms, 1,200 feet of private oceanfront property, a world-class botanic garden with more than 1,500 species of tropical trees and plants, a PGA-standard golf practice area, a sports complex with a tennis court, half basketball court, playground and mini golf course, and even a Robinson Crusoe-style treehouse. The main house, built in the 1940s, was once the home of Gloria Guinness, a 20th century style icon.