fort is said to be constructed on the historic site of Indraprastha
(900BC) by Humayun and Sher Shah. Covering a circuit of about a
mile, the walls of the fort have three gates and are surrounded
by a mat fed by the river Yamuna. The wall was built by Humayun
while the buildings in the fort are attributed to Sher Shah. The
notable buildings that have survived in the fort are the Sher Mandal
and the Quila-I-kholina Mosque.
Mandal is a two storeyed octagonal tower which was used by Humayun
as his library. The mosque, built around 1541-42, is a landmark
in Indo Islamic architecture. The architect has shown skill by enriching
each part with moulding, bracketed openings, marble inlay, carving
and other establishments. A variety of materials have also been
used to construct the small mosque (168 x 44 feet). The entrance
arch is of marble, the spandrels of red sandstone studded with marble
bossed, the columns and pilasters of black and white marble.