Thessaloniki is a big Greek city located on the Aegean Sea and the capital of the region of Macedonia. The city was founded around 315 BC by Cassander of Macedon, who named the settlement after his wife Thessalonica. The 16th-century White Tower is the symbol of the city and today it houses the Museum of Byzantine Culture. The remains of the 3rd-century Arc of Triumph and the Rotunda of Galerius have been preserved in Thessaloniki. The Byzantine fortifications with the Heptapyrgion citadel and temples built in the early Middle Ages are also considered the precious monuments of the city .