The complex was built on the site of the former Ellinikon International Airport for the staging of the 2004 Summer Olympics and 2004 Summer Paralympics, and consisted of the following venues: Helliniko Indoor Arena (Basketball and Team handball); Helliniko Fencing Hall; Olympic Hockey Stadium (Field hockey); Helliniko Baseball Centre; Helliniko Softball Centre; and Helliniko Slalom Centre (Whitewater slalom).