bridges across the river, the oldest of which is Purana Pul—("old bridge") built in 1578 AD. Hyderabad is twinned with neighbouring Secunderabad, to which it is connected by Hussain Sagar. Many historic and heritage sites lie in south central Hyderabad, such as the Charminar, Mecca Masjid, Salar Jung Museum, Nizam Museum, Telangana High Court, Falaknuma Palace, Chowmahalla Palace and the traditional retail corridor comprising the Pearl Market, Laad Bazaar and Madina Circle. North of the river are hospitals, colleges, major railway stations and business areas such as Begum Bazaar, Koti, Abids, Sultan Bazar and Moazzam Jahi Market, along with administrative and recreational establishments such as the Reserve Bank of India, the Telangana Secretariat, the India Government Mint, the Telangana Legislature, the Public Gardens, Shahi Masjid, the Nizam Club, the Ravindra Bharathi, the State Museum, the Birla Temple and the Birla Planetarium. North of central Hyderabad lie Hussain Sagar, Tank Bund Road, Rani Gunj and the Secunderabad railway station. Most of the city's parks and recreational centres, such as Sanjeevaiah Park, Indira Park, Lumbini Park, NTR Gardens, the Buddha statue and Tankbund Park are located here. In the northwest part of the city there are upscale residential and commercial areas such as Banjara Hills, Jubilee Hills, Begumpet, Khairtabad, Tolichowki, Jagannath Temple and Miyapur. The northern end contains industrial areas such as Kukatpally, Sanathnagar, Moosapet, Balanagar, Patancheru and Chanda Nagar. The northeast end is dotted with residential areas such as Malkajgiri, Neredmet, A. S. Rao Nagar and Uppal. In the eastern part of the city lie many defence research centres and Ramoji Film City. The "Cyberabad" area in the southwest and west of the city, consisting of Madhapur and Gachibowli has grown rapidly since the 1990s. It is home to information technology and bio-pharmaceutical companies and to landmarks such as Hyderabad Airport, Osman Sagar, Himayath Sagar and Kasu Brahmananda Reddy National Park. Landmarks Heritage buildings constructed during the Qutb Shahi and Nizam eras showcase Indo-Islamic architecture influenced by Medieval, Mughal and European styles. After the 1908 flooding of the Musi River, the city was expanded and civic monuments constructed, particularly during the rule of Mir Osman Ali Khan (the VIIth Nizam), whose patronage of architecture led to him being referred to as the maker of modern Hyderabad. In 2012, the government of India declared Hyderabad the first "Best heritage city of India". Qutb Shahi architecture of the 16th and early 17th centuries