Royal Residence in Potomac, MD, for $3.1M

Even the paneled, private library has a fireplace—as does the great room, which also features a vaulted-ceiling and a wet bar. The estate has undergone almost $2 million worth of renovations over the years. Most recent on that list are the kitchen, primary and secondary baths, the roof, and the mechanical systems. The kitchen was equipped with a massive, double-sink dining island and multiple French doors that give way to the verdant gardens beyond.