The 'Three Hundred Towers' nickname refers to the defensive walls that historically enclosed the entire town of Onda, not just the castle keep.
The site contains one of the most important collections of Islamic plasterwork in the Valencian Community, featuring intricate geometric and epigraphic patterns.
During the 13th century, the castle became a crucial headquarters for the Knights Hospitaller following its conquest by James I.
Archeological excavations have revealed that the hilltop was occupied as early as the Bronze Age, long before the Moorish fortifications were erected.
The strategic elevation allowed the castle to function as a visual communication point with other coastal towers along the Mediterranean.
The castle’s layout was adapted over centuries, transitioning from an Islamic fortress (hisn) into a complex Christian feudal structure.
The Castle of Onda, known locally as the 'Castle of the Three Hundred Towers,' is a fortified site of Islamic origin situated on a strategic hilltop in the province of Castellón. Originally constructed in the 10th century on a Roman settlement, it served as a critical defensive bastion during the Middle Ages. Its structural layout includes a series of defensive walls and a reconstructed keep that provides panoramic views of the Sierra de Espadán and the surrounding plains. The site holds a significant collection of medieval plasterwork, much of which is displayed within the on-site interpretation center. The castle transitioned through Islamic and Christian rule, playing a pivotal role during the Reconquista and the reign of James I of Aragon. Recent restoration efforts have stabilized the ramparts and preserved the interior archeological layers. It is officially designated as a Bien de Interés Cultural, marking it as a site of significant historical heritage in Spain.
The highest platform of the reconstructed keep, which offers a 360-degree view of the town and surrounding mountain ranges.
Wear sturdy, closed-toe walking shoes as the interior paths consist of uneven cobblestones and steep, rocky inclines.
Bring sun protection and water, as there is very limited natural shade throughout the elevated castle grounds.
Check the local tourism office's digital portal before visiting, as the site periodically hosts guided historical reenactments.
Do not attempt the walk up from the town center during the peak heat of a mid-summer afternoon.
The site is typically closed on Mondays; always verify the current schedule via the municipal tourism website before arrival.
Maintain respectful behavior in areas containing exposed archaeological remains; refrain from touching ancient plasterwork.
