[3] Alauddin is the best known of the Khalji dynasty because he extended his dominion to Southern India and established the second city of Delhi, Siri.

[5] The first city is considered to be built by Muslims, it was in an oval shape; its ruins are presently seen in an area of about 1.7 km2 (0.7 sq mi).

The structures built in Siri were stated to have had a fine imprint of the enthusiasm of the rulers of Khalji dynasty (particularly, the first three out of six Rulers of the Dynasty) with Allauddin's deep interests in architecture and his achievements supported by the imported skills of the artists of Seljuqs richly contributing to the efforts to build the new city.

In eastern part of the ruins there are remnants of flame-shaped battlements, loop holes for arrows, and bastions, which were considered unique new additions of that period.

Tohfewala Gumbad Masjid (pictured) is one such structure whose ruins show the form of domed central apartment and sloping wall characteristic of Khaljis architecture.

[1] Apart from building the Siri Fort, the citadel around it and the water supply system with a reservoir at Hauz Khas Complex (in present Hauz Khas locality) for providing water supply to Siri, his new city, Ala-ud-din also expanded the building activity around the religious city of the first city complex of Qutb complex by making additions to the Quwwatul-Islam Mosque, which doubled its original size, additions to the Qutub Minar itself (Nagari inscriptions on the tower attribute to this tower as "Vijaya sthamba" or victory tower of Ala-ud-din) and a grandiose plan of constructing a new Minar (tower) bigger (double) that of the Qutub Minar.

In particular, Sher Shah Suri (1540–1545), of Pashtun Afghan descent from Eastern India (Bihar), took away material from Siri to build his own city.

Among these buildings are a large sports complex of courts for tennis, badminton and basketball, a swimming pool, a golf course, gymnasium, aerobics centre, jogging tracks, cricket grounds, large auditoriums, upscale residential buildings, deluxe food joints and commercial establishments.

In addition, the stretch adjoining Panchsheel Park, which has been evaluated as in a bad shape, has also been identified for undertaking restoration works at a cost of Rs 30 lakhs (US$60,000).

[17] It is a prestigious entertainment centre in New Delhi where film festivals, dance performances, plays and music recitals are organized.