We were a group of 2 couples visiting Delos off a boat ferry from Mykonos . After offloading we were waiting in line for tickets when we met Antonis who was offering his guide services. We booked a one hour tour with him and we're very happy with that decision. After a 15 minute review of 3000 years of Greek history, he took us through the general living areas of Delos explaining interesting sites and their significance. Limited by time, he was able to show us the rest of the Temple area and get us back to our return trip on time. Antonis is extraordinarily knowledgeable and engaging. Wish we had more time to learn more from this interesting person.