At Flisvos Marina, you can find a few old ships from the Greek Navy. Averof a battleship from early 1900 era, given as a gift to Greece by G. Averof. Its one of the very few remaining battleships of this era. You can go inside and see the living conditions of the crew as well as the technological state of that age. Recomended if you like this sort of things. Check opening hours before you go.