Ares del Maestrat Castle crowns an imposing limestone rock at 1,231 metres altitude in the heart of Alto Maestrazgo. Tradition identifies it as the first stronghold conquered during the formation of the future Kingdom of Valencia, granting it a prominent symbolic place in Valencian historiography. Roman structures previously existed on the site, taking advantage of the strategic position of the promontory.

During the Andalusian period, an Islamic fortress was built that dominated access routes between the mountainous interior and the coast. Between the 11th and 13th centuries, it passed through the hands of various powers until the Order of the Temple took control of the stronghold, leaving its mark on the defensive structure. The castle's Templar connection is one of the features that has most attracted the interest of researchers and travellers.

Architecturally, the complex is an example of a rock castle adapted to the terrain's morphology: its walls are integrated with living rock and it features an artificial cave excavated into the stone, a singular element rarely found in other castles in the region. The preserved remains include sections of defensive walls and tower vestiges.

The castle stands above the urban centre of the municipality of Ares del Maestrat, a small village of barely a hundred inhabitants distributed around the base of the crag. Access is on foot from the village itself, with marked trails allowing visitors to reach the ruins. Views from the top encompass a broad panorama of Maestrazgo and, on clear days, extend to the Mediterranean coast.

The site is catalogued as a Heritage Interest Property (BIC), which guarantees its legal protection within the framework of Spanish historical heritage. The Provincial Council of Castellón and provincial tourism bodies include it among the most representative heritage resources of the Maestrazgo region.