Mirów Castle in Książ Wielki was built by the Bishop of Kraków Piotr Myszkowski and his nephew Piotr, owners of Książ Wielki, in 1585-1595. Myszkowski commissioned the royal architect, Santi Gucci, an outstanding mannerist artist from Florence, to construct his residence. The design was modelled on the Italian palazzos from the early 16th century, and the composition rigorously followed axes and maintained symmetry.

The castle is built of Pińczów stone on the plan of a rectangle elongated along a north-south axis. Its central part features two avant-corps (from the front and from the garden side), with smaller ones by the side walls. The cellars and the ground floor carry Renaissance lunette vaulting. The external walls of the ground and first floors are covered with faceted rustication, while those of the second remain plain. Renaissance cornices and window frames have been preserved over the first floor windows.

Two symmetrical pavilions were built at the same time as the castle. They were erected on avant-corps along the line of the outside defence wall. From the side of the castle, the pavilions have extended porticoes and rich architectural decoration. One of them played the role of the castle chapel, and the other of the library. A garden-park with traditional tree stands was laid out around the residence, and a system of fishponds was set up at the foot of the hill.

The Wielopolscy, owners of Książ Wielki in the 18th and 19th centuries, introduced significant changes both inside and outside the castle. The Renaissance uppermost section of the building was removed, and the central avant-corps was heightened by the addition of another (third) storey.

Today, the building is home to the Wincenty Witos Complex of Schools in Książ Wielki.