The Omni coliseum was an indoor arena located in Atlanta, Georgia. Completed in 1972, the arena was considered an architectural marvel when first constructed, combining innovative design for the roof, seating, and the structure itself. On July 26, 1997, the Omni was demolished, and Philips Arena, which was constructed on the site, opened on September 18, 1999. What was your most memorable event in the Omni Coliseum? We would have to say our two most memorable events in the Omni are Earth, Wind, And Fire in 1981, and the mothership landing.