
The Purana Quila or the old fort was
constructed by Humayun and Sher Shah. The old fort complex covers an area of about a mile.
The walls of Purana Quila have three gates (the Humayun Darwaza, Talaqi Darwaza and Bara Darwaza) and are surrounded by a moat, which was fed by river Yamuna. The double-storied gates of the Purana Quila are quite massive and are built with red sandstone. The walls of the old fort are said to be built by Humayun while the
buildings in the old fort are attributed to Sher Shar, the Sur ruler. Of all the surviving buildings in the old fort complex, the Sher Mandal and the Quila-i-kunha Mosque are notable.
The Sher Mandal was built by Humayun. It is a two storied octagonal tower, used by Humayun as his