The history of Dreamworld dates back to the mid-1970s when John Longhurst envisioned the future theme park. After a seven-year construction period, Dreamworld officially opened to the public on 15 December 1981. Now owned by publicly listed Ardent Leisure, the park has seen many expansions, closures and replacements over its 30-year history. Throughout 2011, Dreamworld celebrated its 30th birthday by investing money in a variety of attractions over the course of the year.