Rio Castle built
1499 CE.
Shown on the map at 38.311°, 21.781°.
The Rio Castle (Greek: κάστρο του Ρίου), historically known as the Castle of the Morea (Italian: Castello de Morea) in opposition to its counterpart, the Castle of Rumelia at Antirrio, is located at the north tip of the Rio peninsula in Achaea, Greece, at the entrance of the Corinthian Gulf. The Rio-Antirio Bridge is located next to it, and the local ferry docks lie on either side. Today it is used for cultural purposes, especially concerts and is a tourist attraction. The castle was built by the Ottoman Sultan Bayezid II in 1499 above the ruins of an ancient temple of Poseidon, within three months. Along with its twin, the Antirrio Castle, they were intended to protect the entrance to the Corinthian Gulf, and were nicknamed the "Little Dardanelles". The castle is located on the sea shore, with its northern side protected by the sea and the southern by a broad moat, filled with sea water, and two outer bastions (ravelins), linked to the main fort by stone bridges. It has two gates, the central one, facing landwards, and the sea gate. In 1533, it was briefly captured by the Genoese under Andrea Doria, but the Ottomans recaptured it later in the year.
Text from the Wikipedia article Rio Castle, licensed CC BY-SA 4.0.