The mention of Niagara Falls, reminded me of the statue of Nikola Tesla there at the hydroelectric section. It's a shame, if his laboratory, at then Wardenclyffe, on Long Island, NY has been torn down, once to become a science museum, if there removed over the former photo processors (Peerless) there in the HAZMAT cleanup. Just the other day it was announced that "rechargers" could be powered by Wifi hotspots and this was an early idea of his. I salute Obscura and liked to enjoy the tour of the nearby Brookhaven National Laboratory, though a little too obscura back then and you'd be picked up and returned to the guided tour. It's now run by a consortium of higher learning rather than the US DOE. Should it too be a UNESCO site little brother?