recognised World Heritage Sites. The Walled City of Lahore, Badshahi Mosque, Wazir Khan Mosque, Tomb of Jahangir and Nur Jahan, Tomb of Asaf Khan, Chauburji and other major sites visited by tourists each year. Murree is a famous hill station stop for tourists. The Pharwala Fort, which was built by an ancient Hindu civilisation, is on the outskirts of the city. The city of Sheikhupura also has a number of sites from the Mughal Empire, including the World Heritage-listed Rohtas Fort near Jhelum. The Katasraj temple in the city of Chakwal is a major destination for Hindu devotees. The Khewra Salt Mines is one of the oldest mines in South Asia. Faisalabad's clock tower and eight bazaars were designed to represent the Union Jack. The province's southward is arid. Multan is known for its mausoleums of saints and Sufi pirs. The Multan Museum, Multan fort, DHA 360° zoo and Nuagaza tombs are significant attractions in the city. The city of Bahawalpur is located near the Cholistan and Thar deserts. Derawar Fort in the Cholistan Desert is the site for the annual Cholistan Jeep Rally. The city is also near the ancient site of Uch Sharif which was once a Delhi Sultanate stronghold. The Noor Mahal, Sadiq Ghar Palace, Darbar Mall were built during the reign of the Nawabs. The Lal Suhanra National Park is a major zoological garden on the outskirts of the city. Social issues The use of Urdu and English as the near exclusive languages of broadcasting, the public sector, and formal education have led some to fear that the Punjabi language in the province is being relegated to a low-status language and that it is being denied an environment where it can flourish. In August 2015, the Pakistan Academy of Letters, International Writer's Council (IWC) and World Punjabi Congress (WPC) organised the Khawaja Farid Conference and demanded that a Punjabi-language university should be established in Lahore and that Punjabi language should be declared as the medium of instruction at the primary level. In September 2015, a case was filed in Supreme Court of Pakistan against Government of Punjab, Pakistan as it did not take any step to implement the Punjabi language in the province. Additionally, several thousand Punjabis gather in Lahore every year on International Mother Language Day. Hafiz Saeed, chief of Jama'at-ud-Da'wah (JuD) has questioned Pakistan's decision to adopt Urdu as its national language in a