A year earlier, the brothers opened The World of Sid & Marty Krofft theme park in downtown Atlanta’s new Omni Complex (now CNN’s headquarters). Spread over six levels, it was billed as the world’s first vertical amusement park. About 600,000 visitors came during the recession-plagued ’70s, but it wasn’t enough to cover the costs and interest payments, and the park closed after six months. (Much of the financing for the $20 million park came through loans from various banks and investments from Lamar Hunt, the Ford Foundation and others.