The Cromwell Museum is housed in the old
grammar school building attended by Cromwell and the diarist
Samuel Pepys. The building retains fragments of the medieval
infirmary hall of the Hospital of St John the Baptist (circa 1170–90). Vested in the corporation of the town, the hospital building became
Huntingdon Grammar School which remained in the building until moving to a new location in 1896, eventually moving to
Hinchingbrooke House on the outskirts of the town. It was remodelled and partially rebuilt in 1863, and then heavily restored in 1878 under the direction of architect Robert Hutchinson at a cost of £900. The work was paid for by the dramatist
Dion Boucicault in memory of his son, killed in the
Abbots Ripton rail accident of 1876. The building had been encased in brick and when this was removed a blocked
Romanesque doorway was discovered. Other features of the exterior include a bellcote, five decorative arches on its west front and two bays of the hall's nave and aisles. File:Cromwell Museum, Huntingdon from the High Street.jpg|12th century face of the Cromwell Museum from the High Street File:Model of Monastic Spital that preceded Huntingdon Grammar School and Cromwell Museum.jpg|Model of spital that preceded the Grammar School. Arches support the
nave, giving access to the now-demolished side buildings. Only the left-hand end of the nave (with two arched bays) survives. File:Cromwell Museum with infilled arches and doorway.jpg|Corner view, showing infilled arches and doorway of the former monastic spital for reuse as Grammar School ==Collections==