wiki has a good article on Smyth and the great pyramid.
http://en.wikipedia.org/wiki/Charles_Piazzi_Smyth
It's hard to say who came up with which idea first. In the second half of the 19th century all sorts of nutty ideas were floating around. Days for years, invisible presences and pyramids were just the tip of the iceberg. People took the idea of fairey's seriously, also self-teleportation, astrology, the history of Atlantis and Mu, levitation by mental power, mind reading, palmistry, phrenology; take your pick. It's all the same dope, just in a different baggie.