39 kms from Sasaram are the
remains of Sher Shah Suri's Rohtasgarh fort, It now occupies a part of the
plateau about 4 miles east to west and 5 miles north to south, 28 miles in
circumference. 
It is considered one of the largest and strongest hill forts in India.
this fort served as a safe shelter for treasures and families of Sher Shah
Suri, Shah Jahan, maan singh, Mir Qasim (and others during the revolt of
185). Records suggest that there are 84 passages to the hill with 14 main
gates entry. However Sher Shah Closed ten of them.