This is Prague Castle, which lies on a hill that is a bugger to climb. I was there in October and it was briskly cold but offered up crystal blue skies. Visitors reach the castle by crossing Charles Bridge and walking through Mala Strana "Lesser Town" and uphill.
This is the view from one of the towers on Charles Bridge. Obviously, the bridge is a great place to people-watch as well as find souvenir hawkers and street musicians.
These are views of both Castle Hill and Charles Bridge, day and night.