8 News Now looks back at strange occurrences in Nevada, from a monolith appearing to unknown lights in the sky. 00:00 The hunt is on after mystery monolith reappears near Las Vegas 2:30 Viewer shares video of 'mysterious lights' hovering in night sky over Las Vegas valley 2:57 New video shows mysterious flying sphere vanishing into ocean 6:44 I-Team: Nevada landed in UFO spotlight 75 years ago with close encounter at Lake Mead 8:00 Unsolved mystery on 'The Big Lonely': What happened to Patrick Carnes? 13:30 Henderson residents question mysterious dust cloud, experts explain its cause