An open-air collection of bowled stones and millstones, which includes about 321 exhibits, has been accumulated in the homestead of Pasvalys resident and museum-keeper Antanas Stapulionis (1930-2011): An exposition of 214 millstones, 64 bowl stones, 7 “footed” stones, 2 boundary stones, and mill gears. The collection of exhibits started in 1979.

On the occasion of the 10th anniversary of Pasvalys County Museum, A. Stapulionis donated the millstone exposition to the Regional Museum.