  the olympic athletic center of athens "spiros louis" () or oaca (), is a sport facilities complex located at marousi, northeast athens, greece. the complex consists of five major venues as well as other supplementary sport facilities. the olympic athletic center of athens has hosted the mediterranean games in 1991, the world championship in athletics in 1997 as well as other important athletic and cultural events. the most significant event the athens olympic sports complex has hosted, was the olympic games. oaca was the main venue for the athens olympic games in 2004. the complex was revamped for the games under a design produced by the spanish architect santiago calatrava. ==venues== ===olympic stadium===  the stadium, built in 1982 and refurbished in 2004, hosted the athletics events and the soccer final, as well as the opening ceremony on august 13, 2004 and the closing ceremony on august 29, 2004. it is currently used as the home ground of aek athens fc and panathinaikos fc, two of the biggest football clubs in greece. the stadium was originally built in 1982 and was extensively refurbished for the games, including the addition of a roof. ===olympic indoor hall===   the olympic indoor hall (also known simply as the indoor hall) was completed in 1995 and was the largest indoor venue in use for sporting events at the 2004 summer olympics in athens, greece. it is part of the athens olympic sports complex, in the suburb of maroussi. the arena was used for artistic gymnastics and trampolining and also hosted the finals of the basketball matches at the games. on may 18 an
2004_Summer_Olympic_venues Indoor_arenas_in_Greece Olympic_Parks Olympic_swimming_venues Santiago_Calatrava_structures Sports_venues_completed_in_1982 Swimming_venues