English: Kalavantin Durg (fort), is located in the Indian state of Maharashtra, between Matheran and Panvel. Access to the top is possible only by ascending thousands of hand-carved steps. The so-called “Climb to Heaven" attracts many visitors every year. Kalavantin Durg's history is often mixed with that of the nearby Prabalgad Fort. Prabalgad was built at 685-metre (2,300 foot) high stone spire around 530 BC during Bahmani Sultanate. Around 1458 AD the fort was taken over by Ahmadnagar Sultanate. In the following centuries it was conquered by the Mughal Empire, and became the theater of many battles by different dynasties. In 1826 it briefly became a home for Umaji Naik, a freedom fighter against the British Empire.