The Gonio Fortress, also called Apsaros and Apsyrtos, is a historical marvel with roots dating back to the 1st century. The fortress has been converted into a museum since 2010 and offers a glimpse into centuries of history with exhibits ranging from the early 19th century to the 1980s. It stands as a brilliant piece of Roman-Byzantine military architecture. Remnants of 18 out of 22 towers, a bath, the garrison mosque, and cobblestone pavements are some highlights of this Roman fortress.
Originally the fortress had four entrances but now only the western gate remains open. According to a legend, it is the burial site of one of Christ’s apostles, St. Matthew, giving the place a religious significance. Visitors can also access the memorial stone marking the grave. You can take a short walk to the nearby Gonio Beach, one of the city's less crowded beaches.