I am visiting Turkye for 2 months this winter, and this time I visited Dim Cave which is located in the mountains, about 11 km outside Alanya.
The cave is the second largest open for visitors in Turkiye and was opened to the public in 1999. It has a length of 320 meters, and the height is up to 15 meters. Inside you will see a lot of spectacular Stalactites, Dickite, and Travertine.
Here is the official web page, where you can read more information:
Also, I give my warmest recommendations to visit the cave, if you ever get the chance.