The Olympic Indoor Sports Centre (also known simply as the Indoor Hall or the Olympic Sports Hall) which is part of the Olympic Athletic Center of Athens (O.A.C.A.) "Spiros Louis" (in Greek: O.A.K.A.), 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 located in the suburb of Maroussi. It is considered to be one of the biggest and most modern indoor sports arenas in all of Europe. In Greece it is known as the O.A.K.A. Indoor Hall and/or the O.A.K.A.