Found with Rayman relatively early on a Sunday Morning (about 9:30 or so), on the way to play golf in Attica. I have never been inside the Opera House, but it's a very interesting looking building, which I have seen many times. Found it I believe before Rayman's Delorme GPSr even booted up. Thank you for your BITcaching efforts. Not hugely popular, but hey, more popular than Munzees, apparently.