walls, punctuated by turrets and bastions that vary in height from on the river side to on the city side. The fort is octagonal, with the north–south axis longer than the east–west axis. The marble, floral decorations and the fort's double domes exemplify later Mughal architecture. It showcases a high level of ornamentation, and the Kohinoor diamond was reportedly part of the furnishings. The fort's artwork synthesises Persian, European and Indian art, resulting in a unique Shahjahani style rich in form, expression and colour. Red Fort is one of the building complexes of India encapsulating a long period of history and its arts. Even before its 1913 commemoration as a monument of national importance, efforts were made to preserve it for posterity. The Lahori and Delhi Gates were used by the public, and the Khizrabad Gate was for the emperor. The Lahori Gate is the main entrance, leading to a domed shopping area known as the Chatta Chowk (covered bazaar). Major structures The most important surviving structures are the walls and ramparts, the main gates, the audience halls and the imperial apartments on the eastern riverbank. Lahori Gate The Lahori Gate is the main gate to the Red Fort, named for its orientation towards the city of Lahore. During Aurangzeb's reign, the beauty of the gate was altered by the addition of a barbican, which Shah Jahan described as "a veil drawn across the face of a beautiful woman". Every Indian Independence Day since 1947, the national flag is unfurled and the prime minister makes a speech from its ramparts. Delhi Gate The Delhi Gate is the southern public entrance and is similar in layout and appearance to the Lahori Gate. Two life-size stone elephants on either side of the gate face each other. Chhatta Chowk Adjacent to the Lahori Gate is the Chhatta Chowk (or Meena Bazaar), where silk, jewellery and other items for the imperial household were sold during the Mughal period. This market was earlier known as Bazaar-i-Musaqqaf or Chatta-bazaar (both meaning "roofed market"). Lahori Gate, the entrance portal of the Red Fort, leads into an open outer court, where it crosses the large north–south street which originally divided the fort's military functions (to the west) from the palaces (to the east). The southern end of the street is the Delhi Gate. Naubat Khana In the east wall of the court stands the now-isolated Naubat Khana (Persian: