The granary is a brick construction in its thick interiors and thick mud on its external walls, with quarry stones that reinforce the corners or angles of the building. It must have been built in the second half of the 16th century and, on one side of its plant, it has private houses of more immediate construction. It communicates underground with the castle through a passage excavated in the 60s by the master builder Antonio Cantero.
Rectangular in layout, the granary is made up of two floors, the first below the level of Calle del Castillo, which was accessed from the opposite street. It has this, three naves covered with barrel vaults and twelve lowered semicircular arches, made of brick on stone pilasters. In its upper part, it is similar in outline, it only varies in the heights and proportions of its arches. It is covered with a flat and gabled vault, which we can see from the outside of the building. On this floor, the radii of the arches are larger and, therefore, their number is less since it has six arched units.
The presence of Miguel de Cervantes in Lopera is confirmed in various documents from the time when he was commissioner for the collection of grain for the galleys. Thus it is known that at least between February 22 and 25, 1592, Cervantes was in Lopera, where he collected for the Invincible Armada the amount of 200 bushels of wheat and 60 bushels of barley. He even stayed the night at the Posada de la Cruz, located on Calle Real.
As we have mentioned previously, the ground floor of the tertiary was used as a cellar, here the wine criaderas were located, since this place was ideal due to its temperature. At the entrance of the ground floor, just to the right, was the "Sacristy", where the best soleras of the winery were found. Some of the barrels that were there presented inscriptions of its most illustrious visitors.
At present, the upper part is dedicated to various cultural events, being the headquarters of the Pedro Monje Museum, a sculptor and painter from Lopera born in Lopera in 1945 who at the age of 19 emigrated to Barcelona to take painting and sculpture classes for part of Luis Muntaner. Moje lived to death in Valladolid and is the author of the “Los Colosos” fountain that since 1996 has been located in the Plaza de la Rinconada in the Vallisoletana Capital. In Lopera we find the work of "El Cavador" made of painted iron and located in the Parque de la Verja or that of "the emigrants" that we can see on the esplanade of the Ermita del Santo Cristo.
Likewise, some of his murals and sculptures can be seen at the Ministry of Education in Madrid, in Mayorga ... In addition, different museums and institutions house part of his pictorial, sculptural and ceramic work, such as the Junta de Castilla y León, the Diputación de Valladolid, the Provincial Museum of Jaén or the University of Valladolid among others.