The Red sandstone walls of the massive Red Fort (Lal Qila) rise 33-m above the clamour of Old Delhi as a reminder of the magnificent power and pomp of the Mughal emperors. The walls, built in 1638, were designed to keep out invaders, now they mainly keep out the noise and confusion of the city.
http://www.delhitourism.gov.in/delhitourism/tourist_place/red_fort.jsp