The entrance to the castle is on the southeast side of the hill. The fortress consists of a system of mutually supportive bastions, which are connected by a wall, apart from the Bastion Miltiades, which stands alone and independent within the walls. These eight fortified units are self-sufficient, as each one is supplied with its own cisterns, food-stores and ammunition stockpile, and military living-quarters. The first six bastions were built during the Venetian rule (today the Bastions of Ag. Andreas, Robert, Themistocles, Achilles, Miltiades, and Leonidas), while another was left unfinished by the Venetians, but completed by the Ottomans (the Bastion of Epaminondas). The Ottomans then proceeded to the construction of the eighth and final one (now the Bastion of Fokion).
The defensive capability of the bastions was reinforced by cannon and gun-ports, dry-moats (the Bastion of Miltiades, between those of Themistocles and Achilles), machicolations above the gates (Bastions of Miltiades and Themistocles) or murder-holes (Bastion of Ag. Andreas).
The masonry of the bastions’ faces were made with hewn stones, joined with lime-mortar, while their corners were made by larger stones alla rustica. Also, use is made of a stone horizontal cornice, the cordone. For the cannon-embrasures at the highest parts of the structure, bricks and mortar were employed.
A relief of the lion of Venice is built into the wall above the gate of the Bastion of Ag. Andreas, indicating the year of its construction, 1712, by Agostino Sagredo.
The Palamidi communicated with the city of Nafplio and the Grimani Bastion, which was a part of the Acronafplia fortification by means of a staircase hewn into the west flank of the hill. The lower part was vaulted and had gun-ports, while at its mid-point a small two-storey tower with cannon-embrasures (the Posto) was built .