Looking to spice up your next business trip or to add an interesting property to your portfolio? Try staying at (or buying) a haunted hotel! Every major American city boasts at least one hotel whose ghostly presences have been verified by management staff and guests, not to mention experts on the paranormal. Stay at one and chances are good that you'll sleep with the dead, though it's doubtful you'll sleep like the dead. In other words, you may not wake up feeling rested and fresh for that conference or meeting you've traveled to attend, but chances are high that you'll have some very interesting stories to tell. Managing such a property could also be quite the treat. Here are 13 of the spookiest hotels we could find, just in time for Halloween.