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Photo: Pinakpani, CC BY-SA 4.0 via Wikimedia Commons
An important Sikh place of worship. Built on the spot where their ninth guru, Guru Tegh Bahadur, was beheaded on the orders of the Mughal emperor Aurangzeb. The trunk of the tree beneath which the head of the Guru was severed and the well used by him for taking a bath during his prison term has been preserved in the shrine. The Sikh regiment of the Indian army salutes 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 the Indian army. The Gurudwara came up in 1783. However, due to the volatile political climate in the coming century, the site alternated between being a mosque and a gurudwara. The dispute was finally settled in 1930 when the case was settled in favour of the Sikhs. The Sikhs celebrated their victory by adding gold gild to the domes. It is an oasis of calm in the chaos of Old Delhi's Chandni Chowk. You will need to cover your head (scarves provided for free) and stash your shoes in the shoe storage run by volunteers (also free).
Gurdwara Sis Ganj Sahib is one of the nine historical Gurdwaras in Delhi. It was first constructed in 1783 as a small shrine by Baghel Singh to commemorate the martyrdom site of the ninth Sikh Guru, Tegh Bahadur and was probably expanded after Indian Rebellion of 1857 or after Partition of India. Before its construction the Mughal Kotwali was situated here. After the Indian Rebellion of 1857 the Mughal Kotwali was demolished by the British and the land was given to the Sikhs as the maharaja of Patiala and other Sikh soldiers helped the British to defeat the Mughal soldiers by providing large numbers of ammunition and soldiers. Its current building was made by Rai Bahadur Narain Singh a contractor who build most of roads in Lutyens New Delhi construction under British Rule. 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. The Sikh regiment of the Indian army salute the Sis Ganj Gurudwara before saluting the president of India since 1979, the only instance of saluting twice in the Republic Day parade by a regiment of Indian army.
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श्री दिगंबर जैन लाल मंदिर Shrī Digambar Jain Lāl Mandir
The oldest Jain temple in Delhi, said to be built during the rule of Mughal Emperor Shah Jahan in 1656. The temple compound also has a bird hospital, which treats about 15,000 birds a year. There is also a bookstore in the complex where a wide range of books on Jainism is available, apart from unique curios and souvenirs related to the religion. You should take off your shoes and all other leather goods and hand it to the concerned person before you enter the temple complex.
It was the seat of the Municipal Corporation of Delhi (MCD) from 1866 till late 2009, when offices shifted to a new building at Minto Road. There used to be a clock tower near the town hall till the 1950s when it was demolished.
जामा मस्जिद Jāmā Masjid
The largest mosque in India and a must-see while in Delhi. Beware of dishonest guides who will try to convince you that a tour guide is mandatory and is included in the ₹200 camera fee; they will give you an extremely hurried "tour" of the mosque and then demand a further payment of ₹200-300 for the tour. You can climb to the top of the minaret for ₹100 (locals maybe ₹20). The climb is steep, dark and somewhat claustrophobic, but you'll get great views over the complex and the city. You'll need to cover up your shoulders and legs (scarves and lungis available for rental - about ₹10), and take off your shoes (expect to tip the shoe minder, ₹5 is plenty, or carry your shoes with you in your own bag). Pictures should not be taken during prayer hours. If you're going to sit down don't look too comfortable. Certainly don't eat or become too engrossed in any reading material you may be carrying, the rule is that non-Muslims must make their visits brief and guards will usher along visitors who linger.