major hospitals-clinical centers are located in Zemun: KBC Zemun and KBC Bežanijska Kosa, as is the retirement home Bežanijska Kosa, the largest one in Belgrade. Churches include the Gardoš cemetery church and the Hariš chapel, Saint Nicholas, Saint Archangel Gabriel and two Roman Catholic churches. Zemun is known for many squares, though almost all of them are small in size: Magistratski, Senjski, Veliki, Branka Radičevića, Karađorđev, Masarikov, etc. On one of them, the Zemun open green market is located. The bank of the Danube is turned into Zemunski Kej, a kilometers long promenade, with various entertainment facilities along it, including barges-cafés, amusement park and especially formerly largest hotel in Belgrade, Hotel Jugoslavija. The remnants of the old town which existed during battles between Kingdom of Hungary and Byzantine Empire in the 12th century are known as Zemunski Grad (Zemun Town). Today visible ruins however are of the medieval fortress (angular towers and parts of the defending wall) of the 1521 Ottoman siege. The Kula Sibinjanin Janka (The tower of Janos Hunyadi) or the Millennium tower was built and officially opened on August 20, 1896, to celebrate a thousand years of Hungarian settlement in the Pannonian plain. The tower was built as a combination of various styles, mostly influenced by the Roman elements. Being a natural lookout, it was used by Zemun's firemen for decades. Today, the tower is better known after the Janos Hunyadi, who actually died in the old fortress four and a half centuries before the tower was built. In general, Gardoš is today the most recognizable symbol of Zemun. For the most part, the neighborhood preserved its old looks, with narrow, still mostly cobblestoned streets unsuitable for modern vehicles, and individual residential houses. There are five official parks in Zemun, though there are much more green areas in general. The largest and the oldest is the City park (Gradski park, opened in 1886). There are also the Kej Oslobođenja park (on the quay, renovated in November 2007), Kalvarija, Jelovac and Army park. There are also five official forests: three along the highway (Autoput Forest, Belgrade-Zagreb Highway Forests and Nacional Forest), which cover , Bežanijska Kosa Forest, also along the highway (), and Great and Little War Islands (). Sport The most popular football club in Zemun is FK Zemun, which plays currently in the Serbian First League, the second tier of Serbian football league system, and Teleoptik