The Fort of Salimgarh is closest to the Lal Qila across the Ring Road. It was built by Sher Shah Suri's son Salim Shah. It was an island fort encircled by the river Yamuna. The bridge on the north connects the red Fort with the Fort of Salimgarh. It was used by the British as a prison for the freedom fighters. The fort was renamed as Swatantrata Senani Smarak after the Independence.