The Pythagoreion is an ancient fortified port in Samos, Greece. A nice and tranquil city with charter- and yacht tourism as its main industry today. It has three ports with a new marina and a dock for ferrys and passangerboats to other islands like Pathmos and to mainland Greece and Turkey. I contains ancient Greek and Roman monuments and a famous ancient tunnel, the Tunnel of Eupalinos or Eupalinian aqueduct. Along with the Heraion of Samos, Pythagoreion was registered as a UNESCO World Heritage Site in 1992.