Zafra Castle is a 12th century castle located in the municipality of Campillo de Dueñas.

It is a clear example of a rock castle that stands out for its location in an area of steep orography in which the keep built on top of the rocky cliff stands out.

Partially restored, we will find part of the walls that made up its wall, crenellated, and reinforced with towers at its corners.

In the parade ground, the cistern is preserved, and the keep has a Gothic door with a pointed arch.

Since it is mentioned in the first Fuero de Molina, granted by Don Manrique de Lara, it is supposed to be an Arab fortress.

During the times of King Fernando III el Santo, the third lord of Molina, Gonzalo Pérez de Lara, rebelled against the monarch, took refuge in him. Given the impregnability of the castle, they had to agree on the Concord of Zafra, by which the current Molina de Aragón would become part of the crown of Castile upon the death of Don Gonzalo, losing its status as independent.

An enigma for historians is the space delimited by the fortress walls, which barely leaves room for weapons warehouses or food stores. The hypothesis is being considered that there were large caves carved out of the rock on which it sits.

Zafra Castle and its surroundings have a long history. Fragments of pottery from the Bronze and Iron Age have been found in rock cavities and in the vicinity of the castle. It is possible that the Romans occupied the rock on which the castle now stands, as remains of structures from the classical period have been found on the castle grounds.

The oldest known fortress on the site is believed to have been established by the Visigoths during the time of the Visigoth Kingdom before 720.

The Muslims also had a fortification here, which was used by the Taifa of Toledo.

The Moorish fortress changed hands in 1129 when the northern Christian kingdoms reconquered Zafra as part of the Reconquest of the Iberian Peninsula.

The Kingdom of Aragon assumed control to serve as a key defensive position in the south of its territory, to protect the newly created community of the city and the Land of Daroca.

It was proclaimed by the semi-independent ruler of the area, Don Manrique Pérez de Lara, one of the most important domains of the Charter of Molina de Aragón, proclaimed in 1154.

HBO filmed outdoor scenes for season 6 of its fantasy series Game of Thrones in the castle. The castle depicts the Tower of Joy in three episodes of the season, "Perjuro," "Blood of My Blood," and "Winds of Winter," during flashbacks that reveal a secret from Ned Stark's past.