Red Fort (Lal Qila), Delhi, North India, a UNESCO World Heritage Site, was a fort constructed by Shah Jahan in 1648 and it remained the main residence of the Mughal emperors until 1857. The red sandstone used extensively on the outer walls, explains the name. The ceiling in multiple complexes inside the fort were lined with pure silver and the famous Peacock Throne/Kohinoor Diamond once adorned the palace. Every year on 15th August, Prime Minister of India hoists the National Flag and addresses the nation from here. More pics.