Tucked away in backcountry Greenwich, a 75-acre property once home to Mel Gibson is back on the market, with the current owners asking $25,750,000 for one of Greenwich's "Great Estates." While the mansion spans more than 15,000 square feet, boasting 15 bedrooms, 10 full bathrooms and seven half bathrooms, it's the great hall past the main entrance that makes the most opulent statement.