Villisca, Iowa

My sons a few friends are going to Villisca, Iowa where the Ax Murder house is located. I've heard that it is one of the top 10 most haunted places. My sons and their friends are going to spend the night in this house. They did this last year also and experienced some pretty strange things. I am against this and I don't feel this is a good idea but they are adults and so they make their own decisions. I make sure that I am praying at all time for God's hedge of protection around them.