Lahore (/ləˈhɔːr/; Punjabi: لہور; Urdu: لاہور, pronounced [lɑːˈɦɔːr]) is the capital of the Pakistani province of Punjab. Lahore is the country's second-most populous city after Karachi. Lahore is one of Pakistan's wealthiest cities, with an estimated GDP of $58.14 billion (PPP) as of 2015. Lahore is the largest city and historic cultural centre of the wider Punjab region, and is one of Pakistan's most socially liberal, progressive, and cosmopolitan cities. Lahore's origins reach into antiquity. The city has been controlled by numerous empires throughout the course of its history, including the Hindu Shahis, Ghaznavids, Ghurids, and Delhi Sultanate by the medieval era. Lahore reached the height of its splendour under the Mughal Empire between the late 16th and early 18th century, and served as its capital city for a number of years. The city was captured by the forces of the Afsharid ruler Nader Shah in 1739, and fell into a period of decay while being contested between the Afghans and the Sikhs. Lahore eventually became capital of the Sikh Empire in the early 19th century, and regained much of its lost grandeur. Lahore was then annexed to the British Empire, and made capital of British Punjab. Lahore was central to the independence movements of both India and Pakistan, with the city being the site of both the declaration of Indian Independence, and the resolution calling for the establishment of Pakistan. Lahore experienced some of the worst rioting during the Partition period preceding Pakistan's independence. Following the success of the Pakistan Movement and subsequent independence in 1947, Lahore was declared capital of Pakistan's Punjab province. Lahore exerts a strong cultural influence over Pakistan. Lahore is a major center for Pakistan's publishing industry, and remains the foremost center of Pakistan's literary scene. The city is also a major centre of education in Pakistan, with some of Pakistan's leading universities based in the city. Lahore is also home to Pakistan's film industry, Lollywood, and is a major centre of Qawwali music. The city also hosts much of Pakistan's tourist industry, with major attractions including the Walled City, the famous Badshahi and Wazir Khan mosques and Sikh shrines. Lahore is also home to the Lahore Fort and Shalimar Gardens, both of which are UNESCO World Heritage Sites.