From our recent trip to Eğirdir. Zindan cave is less an hour away from Eğirdir, near the village of Aksu. It is not ticketed by the Ministry of Culture and Tourism so Müze Kartlar are not accepted. It is only a few lira, so no big deal and we were told we must wear one of the provided hard hats.
Like many caves in the area it has probably been inhabited or used for millennia but most of what is present in an archaeological sense is Roman and early byzantine. A sanctuary to the goddess Eurymedon and later a chapel. Outside of the cave in a fairly dramatic canyon is a restored Roman bridge, we may go back and do some walking in the canyon.
The cave is impressive, increasingly cold and damp the further you go in. The accessible parts go in about 700 metres, no doubt it goes further but we were not about to attempt to delve deeper or try to find a labyrinth. The public parts are illuminated. Well worth a trip in our book.