My dears, Didonghe Tiankeng is definitely worth a visit! Here is a guide for you. From Xi'an North Station to Ningqiang South Station, the earlier you leave, the better. After arriving in Ningqiang, you can take a taxi or a bus to the Tiankeng. The half-way journey takes 3 hours, and the full journey takes 5-6 hours. Remember to bring trekking poles, headlights, and some snacks. If you drive by yourself, please contact the guide in advance. I can also be a photographer, if you need me, please contact me privately!