I believe absolutely in ghosts, King Arthur, Dragons, Unicorns, Sasquatch, Nessie, Aliens, the Kraken, the Rukh (Roc), and other things like that.
We don't really have any local ghost stories in Boise, but in my house, there's this picture of an old guy with a beard that came with the house. We don't know who he is, but it's really creepy to look at at night, and you have to walk past it in the hall to get to the kitchen.