The Athens Olympic Complex, also known as OAKA, is a multi-sport complex located in Athens, Greece. It was built to host the 2004 Summer Olympics and includes several venues, such as the Olympic Stadium, the Aquatic Center, and the Velodrome. The complex is designed to accommodate various sports and events, making it a significant part of Greece's sports infrastructure. After the Olympics, the complex has been used for various events, including concerts and sports competitions. It remains a symbol of the 2004 games and is an important site for promoting sports and culture in Greece. The complex is also a popular destination for tourists interested in Olympic history.