Well, I thought this research would take a long time, but it's so interesting, it's hard to put it to rest. This is the map so far of the 50 places I'm studying as samples. I'm finding amazing correlations between geology/waterways/train tracks/history/and building construction. In fact, I'm already able to postulate cities that should have perfect conditions for having ghost phenomenon. Don't know yet what this all means, but I can't wait to get a bit more info so I can tell you more. The hardest part so far is finding out the body of evidence each place has for haunting and the construction of the buildings and geology. I already completed waterways/train tracks and it's really astounding. The most famously and documented haunted places so far have all the elements.
I'll keep you posted as I get more.