The castle of San Fernando is considered to be Europe's largest bastion fortress and declared of Cultural interest, classified as a historical monument under the following references:
- Registro General of goods of Cultural interest of the Ministry of culture and Monuments Catalag i Conjunts Històrics-Artistics, (Departament de Cultura. Generalitat de Catalunya: No. R-I 51-5897).
- Catalogo of the European architectural heritage. No. E-GE - 183.