Holy carp, I really do have 3 movies as 1 in my head. QOS and The International. I guess "fuzzy on the details" was putting it mildly. Hahahaha, wow!
Wonder what the 3rd scene I'm thinking about is from. I remember a small square with tall pillars and a man sitting outside the entrance; it was a hot sunny day. The hero follows 2-3 people down into this underground area with pathways and water, the bad guys meet someone else and while trying to overhear what's going on i think he gets seen. Shooting ensues.