Cehennemağzı Caves is located in Zonguldak. I have stayed in the city as the place and the transportation is easy. It consists of 3 caves which are located in a ruin area. There are small shops where you can have tea, coffee and souvenirs. There is also a restaurant called Antep Table. The caves in the ruins were used as prayer areas during the early Christian period. This region is known as Acheron Valley of the ancient period. The first cave is known as the Ayazma cave. Water was used as a cistern. There is a water pool area inside. This water is considered as healing and holy water means the name of the holy spring. The second cave is the church cave. This area was used as a clinic. Inside, there are sarcophagus sarcophagus sites, which are thought to be the place of Aziz Nile's. The cave is a little up and you can reach the entrance. The entrance is narrow and has a staircase entrance. You can reach the cave down from here, you can be a little cold is recommended to dress according to him. Below is the water pool and a different atmasfer with a nice lighting.It also has rocks representing the main silhouette and 3-headed dog (kerbelos) u. A point of interest for legends. 6 TL per person is paid for entrance. If you have a museum card or teacher card, you can visit it for free