THE TREASURE HOUSE ROMAN LEGION GHOSTS:
David Holt retells the event concerning the experience Harry Martindale had when working in the cellar of the Treasurer's House in York. David Holt gives a brilliant presentation of the events of the day in the 1950s when the 17 year old Harry Martindale witnessed roman soldiers and their horses walk through the walls of the cellar. The 'Treasurer's House' in York is a fascinating National Trust property
https://www.youtube.com/watch?v=wNNDPsRAj9o
STONE TAPE THEORY:
The Stone Tape theory is the speculation that ghosts and hauntings are analogous to tape recordings, and that emotional or traumatic events can somehow be "stored" in rock and other items and "replayed" under certain conditions. The idea was first proposed by British archaeologist turned parapsychologist Thomas Charles Lethbridge in 1961. Lethbridge believed ghosts were not spirits but simply non-interactive recordings similar to a movie.
http://en.wikipedia.org/wiki/Stone_Tape