Kans Qila is located on the banks of the Yamuna River. Though the old fort presently lies in ruins, in its hay day it was the home of the demon, Kansa, the maternal uncle of Lord Krishna.
The fort is built over a large area and has highly fortified walls. The structure reflects a beautiful blend of Hindu and Islamist architectural styles. This is because the fort passed through several hands during its journey. It is said that Raja Man Singh of Amber renovated the fort in the 16th century while Maharaja Sawai Jai Singh of Jaipur built an observatory there. However, there is no sign of the observatory now.