Holy Smokies! The energy of the Crystal Magic shop in West Sedona may blow your mind (in a good way). I thought the top of my head was going to pop off after the first few minutes, but acclimated quickly.
@Julia: The shop had more crystals than I've ever seen anywhere. As for the "top of the head" sensations, I can only assume it's an activation of the energy channel coming down through the crown chakra. It's a kind of a buzz, accompanied by a mild change to equilibrium.