On the verdant hill opposite Davlia, dominates the Castle and the acropolis of ancient Davlida. It is an ancient cyclopean fortress with a long history of use and panoramic view of Mount Parnassos and the plain of the Boeotian Kifissos. In the area of the acropolis, ruins of the fortification from the 4th century BC are preserved. The base of the fortification wall is older and dates back to prehistoric times. The shape of the wall is circular and the only entrance on the north-western side was protected by two towers. The main entrance to the acropolis is called Sideroporta (Iron Door).

This fortified position was in use in medieval times, when it was reinforced. A ruined medieval tower is preserved in the enclosure and another one next to the Sideroporta. Inside the castle, the remains of the medieval chapel of Agioi Theodoroi dominate the interior of the castle, built on the foundations of the ancient temple of Polyad Athena, with building material from the ancient temple. From the chapel, only the synthronon and some columns are preserved. For the construction of other medieval buildings, inside and outside the castle, material from the ancient buildings and walls was used.