Mahasthan museum("Mahastangor jadughar") is located at the Mahasthan of Shibganj of Bogra. Its just 15 kilometer apart from the main town. You can reach there using any publicly available vehicles.
The museum is profound with numerous objects(status, coins, weapon, etc) those are found after the excavation from the archaeological spots around the mahastan.
The museum is closed at Sunday, and at Monday its open from 2:30 to 5:00. Other days its open from 10:00 to 5:00. During the summer season, the closing time extends for one hour for the long day time.