If you are planning, or have already booked, a trip to Grad Sofiya, you probably should check the best things to do in Grad Sofiya in advance.
Above all, the extensive range of exclusive activities will definitely make your stay in Grad Sofiya unique.
In Grad Sofiya you can have extraordinary experiences that you will look back on for a long time. It is most recommended booking those activities in advance, if you do so you are guaranteed to get a ticket plus you will have more free time on your vacation :)