After asking a few locals for the best place to take a photo of the historic Mostar Bridge, I was told that it was atop the minaret of the Koski Mehmed-Pasha Mosque. However, they were holding services at the time, so they invited us to the patio outside the mosque. The charge to climb the minaret is 3 euros. They let the two of us onto the patio for 3 euros. It turned out to be an excellent photo spot.