How or where can I apply to visit and explore haunted places?

I love to watch the TV shows of ghost hunters and would like to be able to visit a haunted place or building. Im not looking to be on TV, but would like to join an investigation for one night or something.How or where can I apply to visit and explore haunted places?Martha Washington Inn, in Abingdon, VA has a several spooks walking around on the top floor all the time.