Mughal Emperor Shahjahan started the construction of the massive fort in 1638, and work was completed in 1648. The master builders of the Red fort were Hamid and Ahmad, while the construction was supervised by other officers, who were amply rewarded by the emperor by appointing them to high positions. The Lal Quila rises above a wide dry moat, in the northeast corner of the original city of Shahjahanabad. Its walls extend upto two kilometre, and vary in height from 18 metres on the river side to 33 metres on the city side.
The places lie along the eastern side of the fort, while two imposing three-storeyed main gateways flanked by semi-octagonal towers and consisting of several apartments are located in the centre of the western and southern sides and are known as the Lahori and Delhi Gates respectively.
The Fort also houses the Diwan-i-Amor the Hall of Public Audiences, where the Emperor would sit and hear complaints of the common folk. His alcove in the wall was marble-panelled, and was set with precious stones, many of which were looted, after the Mutiny of 1857. The Diwan-i-Khas is the hall of private audiences, where the Emperor held private meetings. This hall is made of marble, and its centre-piece used to be the Peacock Throne, which was carried away to Iran by Nadir Shah in 1739.
The other attractions enclosed within this monument are the hammams or the Royal Baths, the Shahi Burj, which used to be Shahjahan's private working area. The floors and dados of these apartments are built with marble, inlaid with floral patterns of multicoloured stones. The two rooms on either side of the present entrance were used. It is believed, by the royal children for their bath.
‘Moti Maszid’ and ‘Rang Mahal’ are two other main attraction of The Red Fort.
The “Moti Masjid” or the Pearl Mosque,was built by Aurangzeb for his personal use. The “Rang Mahal” or the 'Palace of Colors' housed the Emperor's wives and mistresses. This palace was crowned with gilded turrets, delicately painted and decorated with an intricate mosaics of mirrors, and a ceiling overlaid with gold and silver, that was wonderfully reflected in a central pool in the marble floor
Even today, the Lal Quila is an eloquent reminder of the glory of the Mughal era, and its magnificence simply leaves one awestruck. It is still a calm haven of peace, which helps one to break away, from the frantic pace of life outside the walls of the Fort, and transports the visitor to another realm of existence.