Historical sources indicate that the castle was built in the 2nd half of the 14th century. In the 16th century, the most famous of the Kmita family, Piotr, Grand Marshal of the Crown at the court of Sigismund the Old, gave it features of the Renaissance style. Another reconstruction of the castle took place between 1615 and 1621 under Stanisław Lubomirski, according to plans by Maciej Trapoli. Stanisław Lubomirski was also the founder of the defensive monastery of the Discalced Carmelites built south of the castle, in the castle garden, and the founder of Nowy Wiśnicz in 1616. A further extension of the castle took place around 1700. The fortress is a four-winged building with a courtyard and four towers. In the first half of the 17th century, bastion fortifications were added to surround it, and a Baroque entrance gate was added.  Wiśnicz belonged to the Lubomirski family until the mid-18th century. The castle itself reverted to the Lubomirski family after about 150 years, in 1901. Unfortunately, it was in a state of disrepair caused by a major fire in 1831. Restoration work, which began in 1928, was interrupted by the outbreak of the Second World War. From 1949 onwards, the renovation continued, but without the Lubomirskis' involvement, as the castle was taken away from the owners by the communist authorities. Today, the fortress is in very good condition. A museum has been created in the castle interiors in Nowy Wiśnicz, which presents an exhibition on the history of the fortress and its reconstruction. In its interior, photographs depicting the appearance of the castle from long ago are on display, in addition to 19th- and 20th-century furniture, models of various castles and artworks by students of the Nowy Wiśnicz High School of Fine Arts. Also open to the public is the vast ballroom, the plafond room with its gilded ceiling, the acoustic room once used as a place of confession, the castle chapel and the crypt with an exhibition of six sarcophagi, including that of Stanisław Lubomirski.