CASTLE OF ZAFRA (Campillo de Dueñas): Tower of Joy.
A key scene in the show is when we get to know the place where Jon Snow was born. Not because the exact spot where he came to this world was that relevant but to discover his true kinship.
The place of birth was the Tower of Joy. A fortress built on the top of a steep rock in a remote location, far from everything and everyone.
In our world this fortress is the Castle of Zafra, located in the town of Campillo de Dueñas in the north-eastern area of Castilla-La Mancha. The castle is a structure from the 12th century and its high stone walls blend seamlessly with the rock it is constructed on.