Gurudwara Nanak Piao is situated on Rana Pratap Road in the Shakti Nagar area of New Delhi. It was built to commemorate Sri Nanak Dev, the first Sikh Guru. The site where the Gurudwara stands today was once a garden where the Guru had camped during his visit to Delhi in 1505. People who came to visit him, used to shower the Guru and his bard Mardana with numerous gifts, which he distributed among the underprivileged and the poor. In fact, the name of the gurudwara is derived from the habit of Guruji who offered food and water to the hungry and thirsty folk. The well from which Guru Nanak served water to the visitors can still be seen standing inside the complex.

The curious legend associated with Gurudwara Nanak Piao is, when Guru Nanak came to Delhi, Sultan Sikandar Shah Lodi came to know of his visit. The Sultan was aware of the news that the Guru had performed the miracle of reviving a dead elephant. So, he asked Guru Nanak to restore one of his dead elephants. However, the Guru refused and as a reprimand, the Sultan ordered his imprisonment. During the time of his captivity, Delhi suffered a massive earthquake on July 3, 1505. It was assumed that ill treatment towards Guru Nanak had caused the catastrophe. Finally, Sikandar Shah Lodi conceded and ordered the release of the Guru.