NDK - National Palace of Culture, Sofia
They say that this is the biggest Congress Centre in the Balkans. It is located in the centre of the city and faces the Vitosha Mountain
If the wheater is find and shiny, you should visit the little garden in front of NDK.
There are people having bear, children playing around, events and all other fun stuff.
Its a huge structure and you'll see it if in sofia. On the weekends there is a lot going on around the building including music and vendors and I assume many different events inside.
The National Palace of Culture, with its plaza and surrounding parks, makes it an enjoyable and favourite place for people who seek a little relaxation and beauty.
There is where many conventions & concerts happen. Progressive-Metal band, Dream Theater performed a concert here in early July 2002.