Where: Peñafiel, Spain

Start of construction: 10th Century

End of construction: 15th Century

Most important renovation: 20th Century

Accessible: yes, but with guide only

Important fact:

The castle is 210 meters long, 34 meters high and 33 meters wide. There is also a wine museum inside of the castle.

http://www.turismopenafiel.com/recurso.php?m=3&nv=0&id=208&lang=en