Old Pylos castle is a 13th-century fortress near Pylos, Greece. It is one of two castles guarding the strategic bay on which it sits; the other is New Pylos castle. It is also known by its historical Italian and Turkish names, respectively Old Navarino and Anavarin-i atik. Locally, it is simply Palaiokastro (Greek: Παλαιόκαστρο, "old castle"). The castle sits atop an imposing 200-m rock formation on the northern edge of the bay, flanked by sheer cliffs; the naturally defensible site has probably been occupied since classical times. Although there are no physical barriers to access, the castle ruins have been declared "closed" because the structure is considered dangerous.