For me Vitosha mountain is part of Sofia, and my favorite one! In half an hour distance from the city center you can enjoy this magnificent piece of nature, make a nice walk and have an incredible view! (I took the picture in August.)
Passage between the Biological Faculty of Sofia University and Radio Sofia. As a background the University of Architecture, Civil Engineering and Geodesy.
A funny train with the national colours captured somewhere in "Lozenetz". I like the barrack in the background, that bears proud the name "restaurant".