The Dargah-Qutub-Sahib, Delhi, a sanctified place of worship

Qutbuddin Bakhtiyar Kaki's dargah Delhi,en.wikipedia.org.

Dargah Qutub Sahib, Delhi tourmyindia.com

In Delhi, there are countless dargahs and mosques, each has its own historical  value and religious significance.  The Dargah-Qutub-Sahib, situated near Gandak ki Baoli in the Mehrauli village, close to  the Adham Khan’s tomb, is an important place of worship for Muslims who believe in Sufism. India is home to Sufi saints whose teachings are of immense value to the humanity, irrespective of faith being followed by the people. These venerable saints have taught us the the essense of righteous living and charity.  Muslims, who on a visit to Delhi, always make it a point to visit this highly venerated mosque. Qutbuddin Bakhtiyar Kalki (born 1173-died 1235; Kyrgyz Republic), a disciple and spiritual successor of Khwaja Moinuddin Chishti of Ajmer was held in great esteem by the Muslim community here. He was a scholar of the Chishti Order from Delhi.  Before him the Chishti order in India was confined to Ajmer and Nagau. His dargah located adjacent to Zafar Mahal in Mehrauli, and the oldest dargah in Delhi, is also the venue of his annual Urs festivities.  It is  said well-known rulers like  Bahadur Shah I, Shah Alam II and Akbar II lie buried in the various enclosures around the saint’s grave. It is also believed that if a person has deep trust in the mystical powers of  the saint and  makes a wish by tying a thread near the grave, he will get positive results.  
https://en.wikipedia.org/wiki/Qutbuddin_Bakhtiar_Kaki