Visitors row inside Olympias, a replica of an ancient Greek trireme, to sail in the waters of the Saronic Gulf off Athens' southern coast, on July 12, 2017. Following the successful trips of the trireme in the summer of 2016, the Hellenic Navy has organized a new series of seven sails during July and September, offering people aged between 15 and 75 an opportunity to take part in this unique sail trip to the past. (Xinhua/Lefteris Partsalis)
