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Red Fort
Shah Jahan's walled imperial city, finished in 1648 — massive red sandstone ramparts running the length of Old Delhi. The seat of Mughal power, and the place the Prime Minister addresses the nation from each Independence Day: the symbolic heart of the country.

Inside, marble palaces and audience halls survive only in patches. Almost all the bejewelled ceilings were stripped or ransacked by British soldiers who turned the place into barracks after 1857 — so temper your expectations. But hunt out the stories. The Baradari, a twelve-arched pavilion, is where the emperor would sit and compose poetry — or, as the rumours go, fish straight from the Yamuna, which once lapped at the boundary walls before the river withdrew.
If visiting the Jama Masjid, spare a couple of hours and go for the scale, the history, and the walls; the interiors are a shadow of what once stood here. It’s right opposite Chandni Chowk. Ticketed, closed Mondays. The evening sound-and-light show is hit or miss — your call.
Tughlaqabad Fort
The ruined mega fort, built in just a few years in the 1320s by the Tughlaq dynasty, then abandoned almost as fast — cursed, legend says, by a saint whose workers the sultan poached. Today it's a vast, broken sprawl of stone walls and bastions, largely empty, slowly losing to scrub and monkeys. This is the wild card: not a polished monument but a genuine ruin you can clamber over, with huge views and almost no one around. For the explorer, not the sightseer. Go in daylight, wear real shoes, and mind the monkeys – They will approach you for food!
Old Fort (Purana Qila)
Possibly the oldest continuously inhabited site in Delhi — excavations here reach back thousands of years, to the city of legend. The standing walls and gates are 16th-century, Mughal and Sur dynasty. Compact, walkable, with a lake along one side and a small museum of what's been dug up. Easy to combine with the nearby zoo or Crafts Museum. Ticketed; the evening show runs here too. A solid, unhurried hour of very deep history.