Jaighar Fort

Jaigarh Fort is situated on the promontory called the Cheel ka Teela of the Aravalli range; it overlooks the Amer Fort and the Maota Lake, near Amer in Jaipur, Rajasthan, India. The fort was built by Mirza Raja Jai Singh in 1726 to protect the Amer Fort and its palace complex and was named after him.The fort, rugged and similar in structural design to the Amer Fort, is also known as Victory Fort. It has a length of 3 kilometres along the north–south direction and a width of 1 kilometre. The fort features a cannon named "Jaivana", which was manufactured in the fort precincts and was then the world's largest cannon on wheels. Jaigarh Fort and Amer Fort are connected by subterranean passages and considered as one complex.

Source: Wikipedia