This architectural complex is located to the right of the Llobregat river, on one side of the Bauma bridge, very close to the BP-1121 road. The Bauma Factory is a construction made up of two buildings, the Roca and Llubià one, named after the two owners, and the new factory, located on the banks of the river, arranged side by side, following the line of the river course, and separated by the Torre del Amo. The first, older one, built to carry out the finishing and shipping processes, has a single storey and is characterised by a row of twenty-three openings in segmental arches. The second, which was used for spinning and weaving, as well as the flock store, the office and the turbine room, has four storeys and a gable roof, giving it a unitary character. The Torre del Amo is a construction attached to the factory walls on the west corner, forming a main façade facing Monistrol and another one facing the road. The ground plan of the building is made up of two polygonal bodies, a square one equivalent to the porch and a rectangular one, where a lookout tower and the building's outbuildings are located. There is a staircase after the porch with three ovoid arches supported by two pillars with vegetal capitals and a three-slope roof. The tower is square in plan and has a lookout tower crowned with battlements. The unifying element between the two bodies is the roof with two slopes, made of green and reddish tiles. The walls are of exposed brickwork, and the full spaces and openings form vertical strips that fit in perfectly with the general composition of the factory buildings. The facing has several balconies with arches that vary from segmental arches to convex arches and lintelled arches. The plinths, imposts, arches and tympanums are covered with glazed tiles and ceramic friezes that form multicoloured geometric and vegetal compositions. The Bauma factory was founded in the mid-19th century when Narcís Roca and Francesc Llubià joined forces to create the Bauma textile colony. At first, the Bauma factory was known by the names of the two owners: Roca and Llubià, names that lasted until 1929, although they changed hands several times. The saga began with the Güell family, and later, in 1892, it passed into the hands of the Dalmau i Tolrà brothers, who were well known in the textile world. And thirdly, in 1896, they were owned by Joan Vial i Solsona, coinciding with the period of maximum splendour of the factory and the colony. With this new owner, the company underwent significant growth and modernisation in both the factory and the colony, as both parts underwent major extensions and improvements. Also from this period are the extraordinary and emblematic buildings of the Torre del Amo and the Church, built between 1905 and 1908. The Dalmau family kept the property until 1917, when it was taken over by the Parera i Vives brothers, and after 1920 it passed into the hands of Bartomeu Puiggros e Hijos de Bartomeu Puiggros. Finally, in 1930, it passed into the hands of Josep Balcells-Dolors Morató, until 1963, when it closed its doors, to be acquired a few years later by the final owners: Nerpel S.A., who started up the factory again, restored important parts of the building, such as the Torre del Amo, which was in a state of disrepair, and kept the property under the name of Balcells S.A. until 1990, when the company finally ceased to operate, a few years after the death of the new owner, Jaume Amor Ruiz, one of the last great textile entrepreneurs of the industrial era. Bauma is known as the oldest of the three large colonies in the municipality of Castellbell i el Vilar, followed by Colonia Burés and Colonia Borràs. To reach the factory you have to cross a bridge, owned by the factory, which was built in 1859, and which has had to be rebuilt after several floods.