1. Koski Mehmed Pasha Mosque
About 150 meters north of Stari Most, this mosque sits right on the left bank of the Neretva. It was declared a national monument of Bosnia and Herzegovina in 2004, and the complex includes a madrasa, a courtyard fountain (shadrvan), and a small graveyard. The mosque itself is modest in size but carefully proportioned, and the interior has that quiet calm you expect from Ottoman religious architecture. But here's the real reason to come: the minaret. Climb the tight spiral staircase to the top, and you get one of the best views in Mostar. From up there, you look straight down at Stari Most, the emerald Neretva, and the red rooftops of the old town. It's a top sight in Mostar that most visitors stumble into only because it's on the way to the bridge. Admission is 6 BAM (roughly 3 euros), and it's open daily from 9:00 AM to 8:30 PM. The mosque is worth the small fee, but the minaret is the real draw. If you only climb one thing in the old town, make it this. The Neretva River viewpoint from the courtyard garden is also excellent and doesn't require stairs.