Built by the Tughlaqs in a short span from AD 1321-25, this imposing fort may be crumbling, but its soaring walls, massive bastions and huge towers are absolutely magnificent. It's lovely at night when it's lit up and the soft glow gives it a haunting beauty. Steeped in tales of conspiracy, curses and political unrest, this fort built by Ghiyas-ud-din Tughlaq to protect his people from the Mongols, is one of the most captivating sights in the city.