Forbes.com lists the fourth most expensive home in the world as $100 million waterfront estate in Istanbul, Turkey, presented by Alp Sahin at Luici Real Estate Agency. Located on three-quarters of an acre directly on the Bosphorus, this residence offers more than 30,000 square feet of opulent living space in 64 rooms. Details include gilded moldings and crystal chandeliers. The mansion has a rare quay that is nearly 200 feet long. For the entire article, click here.