Thessaloniki is home to a number of prominent archaeological sites. Apart from its recognized UNESCO World Heritage Sites, Thessaloniki features a large two-terraced Roman forum[195] featuring two-storey stoas,[196] dug up by accident in the 1960s.[195] The forum complex also boasts two Roman baths,[197] one of which has been excavated while the other is buried underneath the city.[197]The forum also features a small theater,[195][197] which was also used for gladiatorial games.[196] Although the initial complex was not built in Roman times, it was largely refurbished in the 2nd century.[197] It is believed that the forum and the theater continued to be used until at least the 6th century.[198]