What building/symbol would represent Serbia for you?

Hi everybody!
How are you today?

I'm doing a research on different cultures... and I need a symbol to put on the cover of my Serbian research.

I would like to find out, for you,

1. what building/object or symbol would be representative of Serbian people and their mentality?

2. If you had to choose ONE colour, to represent Serbia, what colour would that be? (my research cover needs to be of one colour)

Please, let me know what you think (it's a survye)

Thank you for your contribution