This post is brought to you by our advertiser, Gravensteen Haunted Productions. Outside of the spooky ghouls on Capitol Hill, Washington DC finally has its own haunted house. Get ready to have the bejeezus scared out of you: Gravensteen Haunted Productions is teaming up with Operation Rebound to conjure up “The Curse of Frau Mueller,” a blood-curdling experience based on a true, homegrown story… The Curse of Frau Mueller haunted house is the largest and…