This particular site had me rethinking a few things about construction of the building which is haunted. I've definitely found that frame homes aren't real good conductors for hauntings, but it appears that concrete may be equal to stone (in that it's made from crushed granite, limestone, and gravel). This reinforced concrete building used a jail from 1910 until it closed in the 70s, combined with the amazing geology of the land, makes a wonderful "conduit."
Apart from the fact I myself had seen a full-body apparition for the first time in my life in this jail's attic, I do admit if something is going to try to make such a huge show, this is an ideal setting.
1. Geology: This is a mining town for copper (a conductor of electricity). There is also schist and granite--fantastic elements.
2. Building: Reinforced concrete.
3. Near a train track.
4. History of death/trauma.
5. Older than 50 years.
I give this one a high 5/6 because of the geology--it's unbelievable and the fact that the building is basically all steel bars indoors and reinforced concrete. Although I don't profess to be a scientist, only self taught about such things, steel is magnetic and the earth there is a highly mined copper area and the combination seems to be very vulnerable to geomagnetic changes in the earth. The night I saw the full-body apparition here, there was also an electron flux alert (indicates geomagnetic activity). I think I must have been there at the ideal time for such a place of potential power to show me something amazing.