
The most important building inside the ruins is the tomb of Firuz Shah Tughlaq. The tomb worn out because of being ignored. It was later repaired during on the orders of Sikandar Lodhi. The buildings which you see at the flank was build by Lodhi in about 1354. It included various halls and chambers which was later converted in to a madrasa or college for theological training. The other bizzare construction are the staircases which join the pond from each floor of the madarsa. You will also find many cenotaphs which are supposed to be built over the possible graves of teachers.
Taimur, who invaded Delhi in 1399, was highly impressed by the tank and buildings around it. He ordered his royal architect to replicate the same design in his hometown Samarkand.