The amazing castle complex was for centuries a military fortress, built by the Marquis of Saluzzo, then acquired by the Savoy, who assigned the project of transformation and expansion in Guarino Guarini. This project was realized only the façade towards the Park. The façade opens onto the square, towards the town, was built between 1755 and 1757 by Giovanni Battista Borra commissioned by the fourth Prince of Carignano, Ludovico Vittorio. The current configuration is the result of further work undertaken since 1832, designed by Ernesto Melano.