It has unique features among the mediaeval fortifications in Cantabria thanks to the conservation of its walled precinct, the remains of the moat and its chapel-fortress.
- Construction: Tower
- Artistic period: Gothic
- Historic period: 12th century
- From Jun 15 to Sep 30
- From Tuesday to Sunday From 10:00 to 14:00 From 18:00 to 20:00
- Closing days: Monday
- Admission free