Chios has an interesting castle just a walking distance from the port. Not the most impressive castle in Greece, but it is a nice sightseeing for an afternoon in the town. It is open till sunset and was first constructed in the Byzantine times, but later it had many reconstructions and additions by the other occupants of the island. Not much survive of this castle today, except for the exterior walls, ruins of some houses, water cisterns and a cemetery. Next to the castle is the Old Town of Chios.