Mostar is a city in southern Bosnia and Herzegovina, on the Neretva River. It is the fourth-largest city in the country. Mostar was named after the bridge keepers (Mostari) who guarded the Stari Most (Old Bridge) over the Neretva. The bridge was destroyed by the retreating Yugoslav Army in 1992, during the Bosnian War, but rebuilt in 2004. Mostar is the cultural and educational centre of Herzegovina. It is home to two universities, the University of Mostar and the American University of Mostar. The city is also home to the Hercegovina Museum, the National Theater, and the Regional Museum. Mostar has a rich tradition of Islamic architecture. The Stari Most were built by the Ottoman architect Mimar Hayruddin in 1566. It is one of the most famous bridges in the world and is considered a symbol of the city.