if you're ever in dc, i highly recommend the o st mansion (self led) champagne tour. a converted  hodge-podge maze of a mansion complete with secret doors, decked out themed rooms, hidden wine cellars, 2 story indoor log cabins, memorabilia and more bathrooms than you could ever use in a lifetime. we snagged a living social deal and wandered our way up 5 levels and across the 5 combined rowhouses, stopping to ogle at the mounds of misplaced books, guitars and chotchkies-all donated and mostly for sale (a hoarders paradise!).  oddly enough, the mansion is also a functioning hotel, so we were never quite sure who (or what) we would find *thankfully nothing traumatizing. we only managed to find around 5 of the countless hidden doors, passages and crawl spaces, so i guess ill just have to go back to find the rest!