Bellagio Hotel & Casino 3600 Las Vegas Boulevard South, Las Vegas, Nevada The innovative circus troupe Cirque du Soleil has scored another ongoing hit with “O”, its groundbreaking spectacle that features a cast of swimmers, divers, acrobats and aerialists in a performance that combines theatrical effects, dance, circus acts, live music and a 1.5-million-gallon pool of water. “O” by Cirque du Soleil takes place Wednesday through Sunday at 7:30 PM and 10:30 PM at the Bellagio Hotel & Casino.