Castillo de Peñíscola (Peñíscola Castle or the Castle of Papa Luna) can be visited for a small admission fee.
For the castle’s history, see Peñíscola: A History. For all practical and other information (rates, opening hours, etc., (in Spanish)), visit http://castillodepeniscola.dipcas.es/
There are various exhibits throughout the castle relating to the history of the castle and town. A former cannon outpost is converted into a beautiful garden with spectacular views, the Parque de Artillería (Artillery Park).
The site also houses a basilica, and a 19th century lighthouse on la Plaza del Faro, with the best views of the castle. The most spectacular views of the surroundings are on the Castle’s rooftop.
The largest room of the castle on the first level of the papal palace must have been Pedro de Luna’s bedroom.
De Luna also had a vast library, one of the better ones in his days, spread over several rooms. His library was perhaps his most beloved possession. He gathered works from the most diverse disciplines: Art, Poetry, History, Mathematics, Architecture, Astronomy, Natural Sciences, Astrology, Magic, etc. Nothing escaped his curiosity and thirst for knowledge. His library was also, in his last days, a source of sorrow. Suffering from poverty, he had little choice but to sell many of his books in order to be pay for the expenses of the castle. Despite these difficulties, Benedict XIII is known to have been a prolific writer. He wrote papal bulls (about 25.000 of them; formal papal documents with a bulla or seal attached), correspondence, sermons, polemics, writings on ecclesiastic studies and law, etc.
There is an annex where de Luna’s workplace used to be and where he met with envoys.
The throne hall, also known as the commanders’ room, was used by the Templars and papal Curia for receptions, hearings, and rituals.
The church, which used to be the chapel of the Knights Templar, became the papal basilica.
Pedro de Luna was buried here between 1423 and 1430, until some of his relatives wanted to pay him a last tribute and moved his body to the palace of Illueca (near Zaragoza), where he was born.
Furthermore, you can visit the Conclave Hall, the gigantic vaulted guards’ quarters, the parade place, the stables, etc.