This is one of the biggest forts in India. It is said that the great Mughal Emperor Babur described the fort as, "The pearl in the necklace of the forts of Hind". The fort, also given the epithet "Gibraltar of India'. A postage stamp has been issued by the Indian Postal Service to commemorate the importance of this fort. Identify this fort.

Gwalior Fort is the correct answer as Mughal Emperor Babur famously described it as 'the pearl in the necklace of the forts of Hind' in his memoir Baburnama after capturing it in 1528. The fort is also called the 'Gibraltar of India' due to its impregnability and strategic location. The Indian Postal Service issued a commemorative stamp honoring its historical importance. Belapur, Mahim, and Kolaba are much smaller coastal forts in Maharashtra.