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:
- General Registry of Goods of Cultural Interest of the Ministry of Culture and Catalog of Monuments and Historical-Artistic Objects (Culture Department. Government of Catalonia: No. R-I-51-5897).
- European Catalog of Architectural Heritage. No. E-GE-183.
Read a short review of the fortification