Cantabria
- Castle of Aldueso
- Castle of Allendelagua
- Castle of Agüero
- Castle of Argüeso
- Castle of Castro Urdiales
- Castle of Cobejo
- Castle of El Collado
- Castle of El Haya
- Castle of Montehano
- Castle of Piñeres
- Castle of Pedraja
- Castle of San Felices de Buelna
- Castle of San Vicente de la Barquera
- Castle of Suances
- Castle of Treceño
- Castillo de Villamoñico
- Castle of Villegas
- Castle of Vispieres
- Palace of Riva-Herrera
- Fort del Mazo
- Battery of San Martín
- Battery of San Martín Alto
- Battery of San Pedro del Mar
- Low Battery of Galvanes
- Torrejón of las Henestrosas
- Torreón of Cartes
- Fortified tower of Venero de Castillo
- Tower of Cabanzón
- Tower of Cadalso
- Tower of Don Borja
- Tower of la Vega (Comillas)
- Tower of los Velasco
- Tower del Merino
- Tower of Orejón de La Lama
- Tower of Mogrovejo and casona señorial.
- Tower of the Infantado
- Tower of Pero Niño
- Tower of Proaño
- Tower of Ruerrero
- Tower of San Martín de Hoyos
- Tower of San Telmo (Cantabria)
- Tower of Venero
- Tower-House of Alvarado
- Tower-House of los Calderón de La Barca
Read more about this topic: List Of Castles In Spain