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Photo: U.S. Air Force photo by Senior Airman Daniel Phelps, Public domain via Wikimedia Commons
The name means “windy cape” and it's the ruins of an ancient city. It was occupied from early Hellenistic times but abandoned in the 7th century AD, probably because of pirate attacks. The main features are the Odeon (a small amphitheatre), the Tethys mosaics next to the Odeon, and the public baths.
Anemurium, also called Animurium, is an ancient city whose ruins, now called Eski Anamur or Anemuryum, are close to the modern Turkish city of Anamur. It was in the Roman province of Cilicia, later Isauria, and was situated near a high promontory that marks the southernmost point of Asia Minor, only 64 km from Cyprus. In the Middle Ages, it was called Stallimur.
© OpenStreetMap contributors
It's not known when the original castle was built, but the Romans, Byzantines, Crusaders, Karamanids and Ottomans all reckoned it was worth keeping in good repair against seaborne attack. It has stout walls, with a moat on the landward side. You enter from the east into the inner courtyard. A high internal wall separates this from the outer castle, where the only intact building is a mosque from 1300. The inner castle perches on rocks to the south. The towers and walls are unsafe and you're not supposed to climb them but many visitors do.
This is a 1420 m cave system, with a short public section.