1. Ozkonak Underground City is one of the lesser-known underground cities in Cappadocia, Turkey. It was built in the Byzantine era around the 5th or 6th century and has eight levels, although only four are accessible to visitors. The city was used by early Christians to hide from invading armies and has features such as stables, a winery, living quarters, and even a church. One interesting fact about Ozkonak is that it is believed to have been able to accommodate around 60,000 people during its time of use.

2. Ozkonak Underground City is open to visitors every day from 8:30 am to 5:30 pm. The phone number for the site is +90 384 219 30 35.

3. The entrance fee for Ozkonak Underground City is 30 Turkish Lira (approximately $3.80 USD) per person. Transportation options to the site include renting a car, taking a taxi or shuttle from Goreme, or joining a guided tour. It is located about 14 kilometers from Goreme, and the journey takes around 20-25 minutes by car.