I had the opportunity to hunt the basement/crawlspace of an 1829 building in south central pa. The owner wants to establish a link between the building and the underground railroad. I need someones expertise on what would be a piece of "solid evidence" that this home was used for that purpose. There is only one entrance to the crawlspace which is about 4 foot in height. It is through the floor in a closet--about 2 foot square. The basement is divided into three parts with a small opening in the stone to access each area. The large home was renovated in 1980 and there is alot of metal debris which now litters these areas (copper wire pieces--nails--screws etc.) My son and I are in the process of removing the junk and hopefully something significant will appear. The only items found so far (good items) were a copper plate which surrounds the key hole for a skeleton key and a 1915 wheat penny. This will take awhile as our time is limited but we do have access anytime.