Mostar is situated on the Neretva River and was named after the bridge keepers (mostari) who in the medieval times guarded the Stari Most (Old Bridge) over the Neretva. The Old Town, spanning both sides of the Neretva, contains most things of interest in Mostar, and in its center is the Old Bridge, focal point of the city. Attentive ears will pick out rushing streams, salesmen crying their wares, as well as church bells and muezzins competing for attention, while steep, cobblestoned streets slowly wind their way down to the fast-flowing, turquoise-blue Neretva River and its Old Bridge, originally built by Suleiman the Magnificent in the 15th century. The Old Bridge is one of Bosnia and Herzegovina's most recognizable landmarks, and is considered one of the most exemplary pieces of Islamic architecture in the Balkans.