Metro Line M4 (Budapest Metro) Metro Line M4 (Budapest Metro) Line 4 (officially: South Buda–Rákospalota (DBR) Line, Metro 4 or M4, and unofficially: Green Line), is the fourth line of the Budapest Metro. It opened on 28 March 2014. The first section, 7.4 km in length and consisting of ten stations, connects the southwestern Kelenföld vasútállomás located in Buda, and the eastern Keleti pályaudvar in Pest, under the River Danube. While three additional sections — one an eastern extension to Bosnyák tér, the second west to Virágpiac, and a third further east to Újpalota — have been planned, these remain unfunded by the Budapest city
Budapest history of Buda, but Budapest is still rich in renaissance and neo-renaissance buildings, like the famous Hungarian State Opera House, the St. Stephen's Basilica and the Hungarian Academy of Sciences. During the Turkish occupation (1541–1686), Islamic culture flourished in Budapest, multiple mosques and baths were built in the city. These were great examples of Ottoman architecture, which was influenced by Muslims from around the world not limited to Turkish, Iranian, Arabian and to a larger extent, Byzantine architecture as well as Islamic traditions. After Holy Army conquered Budapest they turned most of the mosques with Churches, Minarets were turned into