What are the evils in Nanjing? ...

I don't know if you mean "mysterious" or "weird", but I can offer you several places-the top ten extremely cloudy places in Nanjing:

Longjing Road (ancient battlefield); Yuhuatai (mass graves and people, national execution ground); Yuhuatai (mass graves and people, national execution ground); Yaohuamen (I used to live here); Xiaguan area (the riverside is the evil place of Nanjing Massacre); Huashen Lake (Xiazi Lake). These two places are bound to drown people every year; The ghost story of Maigao Bridge; Everyone in Nanjing knows that it is cloudy near Jiqingmen. Xinyue Lake (where there used to be many ancient tombs)