Wikipedia: Gurdwara Sis Ganj Sahib is one of the nine historical Gurdwaras in Delhi. It was first constructed in 1783 to commemorate the martyrdom site of the ninth Sikh Guru, Guru Tegh Bahadur. situated in Chandni Chowk in Old Delhi, it marks the site where the ninth Sikh Guru was beheaded on the orders of the Mughal emperor Aurangzeb on 11 November 1675 for refusing to convert to Islam. The Sikh regiment of the Indian army salute the Sis Ganj Gurudwara after saluting the president of India since 1979, the only instance of saluting twice in the Republic Day parade by a regiment of Indian army