Castillo de la Isabela is a 19th-century palace located in Alcolea, Córdoba province, built in 1871 by Count Ricardo Martel y Fernández de Torres Cabrera as a private residence within his pioneering Colony of Santa Isabel. Notable for its square floor plan with four corner towers—three cylindrical and one polygonal entrance tower—the castle was established to support innovative agricultural development, including Spain's first beet sugar production in 1882. Though abandoned at the end of the 1950s and currently in a ruinous state, the castle represents a unique chapter in agricultural and industrial history, bridging residential ambition with industrial experimentation in rural Andalusia.
