CASTILLO de CUÉLLAR

Where: Cuéllar, Spain

Start of construction: 11th Century

End of construction: 17th Century

Most important renovation: 20th Century

Accessible: yes, but only with guide

Important fact:

In the 13th century Cuéllar was one of Spain's most important northern cities.

https://www.cuellar.es/reservas/visitas/castillo-guiado/