 Scholars have focused on categories of Romanesque/Norman building, including the cathedral church, the parish church, the abbey church, the monastery, the castle, the palace, the great hall, the gatehouse, the civic building, the warehouse, and others.Many architectural features that are associated with Gothic architecture had been developed and used by the architects of Romanesque buildings, particularly in the building of cathedrals and abbey churches.These include ribbed vaults, buttresses, clustered columns, ambulatories, wheel windows, spires, stained glass windows, and richly carved door tympana.