of Tirthankara Mahāvīra is installed here. Even though the capital shifted from Mehrauli after the Slave dynasty rule came to an end, many other dynasties contributed significantly to Mehrauli's architecture. The most visible piece of architecture remains the Qutub Minar which was built by Qutb al-Din Aibak with subsequent additions by Iltutmish and Alauddin Khalji. The Qutb Minar complex is a UNESCO World Heritage Site, and also the venue for the annual Qutub Festival.Mausoleum of a 13th-century Sufi saint, Khwaja Qutbuddin Bakhtiar Kaki, is also situated near the Qutub Minar Complex and the venue for the annual Phoolwalon-ki-sair Festival. The dargah complex also houses graves of later Mughal emperors, Bahadur Shah I, Shah Alam II, and Akbar II, in an adjacent marble enclosure. To the left of the dargah, lies Zafar Mahal, the summer palace of the last Mughal Emperor Bahadur Shah Zafar along with Moti Masjid, a small mosque, built for private prayer by the son of Aurangeb, Bahadur Shah I. Balban's tomb belonging to Balban, Slave dynasty ruler of Delhi Sultanate was constructed here in the 13th century can still be seen through in a dilapidated condition. The architecturally important structure as it is the first true arch in Indo-Islamic architecture. Another tomb, that of Balban's son, Khan Shahid, who died before he could be crowned, is also located nearby in Mehrauli Archeological Park. A baoli or stepwell known as Rajon Ki Baoli was constructed in 1506 during Sikandar Lodhi's reign. It was used to store water though it is now completely dried and is now known as Sukhi Baoli (dry well). The Jamali Kamali mosque was built in 1528, in honour of the Sufi saint Shaikh Hamid bin Fazlullah, also known as Dervish Shaikh Jamali Kamboh Dihlawi or Jalal Khan. The saint's tomb built-in 1536 upon his death is adjacent to the mosque. Near Jamali Kamali lies the tomb of Quli Khan, which during the British period was converted into a country house by the Metcalfe family. Known as ‘the retreat’ or ‘Dilkhusha’, this was built by Sir Thomas Theophilus Metcalfe in true English style as a pleasure retreat by surrounding it with many rest houses, follies, and gardens. 'Dilkhusha' in the Urdu language means "Delight of the Heart". The Adham Khan's Tomb was constructed by Emperor Akbar in memory of his foster brother and general Adham Khan in 1566. The tomb, also known as Bhulbhulaiyan, as