Main Square of San Carlos del Valle Monument · San Carlos del Valle, Campo de Montiel, Ciudad Real A rectangular square measuring 53 by 21 metres with stone columns and wooden balconies, declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in 1993. It is one of the most harmonious square-and-shrine ensembles in La Mancha. Photo: Roberto Abizanda (CC BY-SA 3.0) What to see and do in San Carlos del Valle