You don't have to go far to find a room to build a great man cave. If you don't have a room inside your house, then move to the garage or right behind your house into a storage shed building. These work great! Many men just want their own space to do hobbies or outdoor activities. An outdoor rustic headquarters works well, too. Just think ladies, it won't mess up your house if the man cave is not one of you interior rooms. Houzz.com describes a man cave "as the architectural equivalent to hanging out with you mates." Sort of like the old days, with a tree house and no girls allowed!