12 castles you can rent with your friends for less than $50 a night

Marc/Airbnb Rental sites like Airbnb and HomeAway offer up stays in everything from cabins to castles. Many of the castles are surprisingly affordable, especially if you bring a large group of friends. You can stay in medieval castles in Ireland, England, Belgium, and Spain through HomeAway and Airbnb. There's even a French castle available for stays that will only cost you $12.83 per night on HomeAway if you come with a group of 15. Visit Insider's homepage for more stories. You can rent a 13th...