Poros is an atmospheric island not far from the port of Piraeus. It is built amphitheatrically, while the sights worth visiting definitely include the temple of Poseidon in ancient Kalavria. Take a tour at the monastery of Zoodochos Pigi, the Archaeological Museum and the island’s Folklore Museum. The best beaches of Poros are Askeli, Agapi harbor, Vagonia and the Russian naval station. Poros is an ideal destination for water activities such as swimming, diving and sailing.