Chios Castle: Initially, The Castle or Fortress of Chios enclosed the entire town of Chios. Later, the town expanded beyond the Castle walls. It was during the Byzantine period at the end of the 10th century that the first architectural phase of the monument was built. The original building has been renovated and almost nothing has survived from the initial construction.
The Venetians reconstructed the Central Gate (Porta Maggiore) in 1694. You enter the Castle through this gate, located at the south end.
Ioustiniani Palace, a two-storey building stands in the enclosed area, near the gate. Kria Vrisi (Cold Fountain), the semi-subterranean water cistern built under the Genoese, and the massive tower known as "Kulas" are worth seeing.