Imposing medieval castle perched on the Peña de Peníscola, former residence of Pope Luna (Benedict XIII). The Templars built it between 1294 and 1307 on the remains of a pre-existing Arab fortress, constructing a Romanesque structure that rises 64 metres above sea level. Its perimeter is around 230 metres and its average height is 20 metres.

In 1411 the Order of Montesa ceded the fortress to Benedict XIII, Pope Luna, who inhabited it from 1415 until his death in 1423. During this period Peníscola functioned as a pontifical see and the castle was fitted out to fulfil that role, constituting one of the most singular episodes in its history. Following the pontiff's death, the fortress returned in 1441 to the hands of the Order of Montesa and subsequently to the crown.

Currently the building is owned by the Provincial Council of Castellón. It was declared a Cultural Heritage Asset with the category of Monument on 3 June 1931, with registration code RI-51-0000510.