From a hotel room no bigger than a bathroom in a swanky Strip megaresort, Mark Burstein pried open a trap door and peered through a peephole to the casino floor at Binion's Hotel and Gambling Hall. The trap door led to a glorified crawl space with catwalks and portals the late Fremont Street gambling scion Ted Binion used to spy on suspected cheaters. "We didn't have cameras back then," said Burstein, an engineer at the property. "It was the eye in the sky."