outer and inner gates make the entrance impregnable. During a siege, attackers would employ elephants to crush a fort's gates. Without a level, straight run-up to gather speed, however, that is prevented by this layout. Because the Indian military (the Parachute Brigade in particular) is still using the northern portion of the Agra Fort, the Delhi Gate cannot be used by the public. Tourists enter via the Amar Singh Gate. The site is very important in terms of architectural history. Abul Fazal recorded that five hundred buildings in the beautiful designs of Bengal and Gujarat were built in the fort. Some of them were demolished by Shah Jahan to make way for his white marble palaces. Most of the others were destroyed by the British troops of East India Company between 1803 and 1862 for raising barracks. Hardly thirty Mughal buildings have survived on the south-eastern side, facing the river, such as the Delhi Gate and Akbar Gate and one palace – "Bengali Mahal". Akbar Darwazza (Akbar Gate) was renamed Amar Singh Gate by Shah Jahan. The gate is similar in design to the Delhi Gate. Both are built of red sandstone. The Bengali Mahal is built of red sandstone and is now split into Akbari Mahal and Jahangiri Mahal. Historical sites Jahangir's Hauz (tank) A.D. 1610: This monolithic tank (hauz) was used for bathing. It is 5 feet high, 8 feet in diameter and 25 feet in circumference. On the external side of the rim there is an inscription in Persian which mentions it as 'Hauz-e-Jahangir'. It was first discovered near the courtyard of Akbar's palace. In A.D. 1843 and later it was placed in front of Diwan-e-Am. In 1862, it was shifted to public garden (Company Bagh) where it suffered much damage. Later, Sir John Marshall brought it back to Agra Fort and placed there. Due to this hauz, the palace became famous as Jahangiri Mahal though it is part of Akbar's Bengali mahal. Shahjahani Mahal (1628-35 A.D.): It is situated in between the white marble Khas Mahal and the red stone Jahangiri Mahal and is set transitionally in between these two residential complexes of two different ages. It is the earliest attempt of the Mughal emperor Shahjahan to convert an existing red stone building in accordance with his taste and it was his earliest palace in Agra Fort. It has a large hall, side rooms and an