Cova de Rull sits in the same dry country as its neighbours in the northern Valencian interior, in the hills around Albocàsser, and it carries a different feeling from the great ravine galleries. A cova is a cave, and this one is a modest opening in the rock with painted figures that belong to the Levantine tradition recognised by UNESCO. Archers, animals and signs are rendered in the red pigment that the style is known for, and what survives gives a hint of how many more once decorated the cliffs of this region.
You will not find a ticket office. The shelter is on a hillside, reached on foot, and the exact route depends on local guidance and the current state of the paths.
Riding to this part of Castellón is a pleasure for anyone who likes quiet, winding roads. The surface is mostly good, the bends are frequent but not savage, and the gradients are gentle enough that you can enjoy the views of limestone cliffs and small villages tucked into folds of the hills. In spring the verges are full of wild orchids and rosemary flowers, and in autumn the hunters' trucks are about early in the morning, so ride carefully near the field edges. Albocàsser and Catí are the two nearest villages, both small, with a bar or two. Alcalà de Xivert, a larger town at about eighteen kilometres, has fuel and supermarkets.
Weather in the Maestrat is changeable. The mountains behind the coast catch moisture in winter and the temperature can drop fast, so a layer in the top box is sensible. In summer the heat is dry and relentless, and the rock face can burn bare skin. Late April and early October are the best times, with soft light and few other visitors.
If you have time, add a stop in Catí for the goat's cheese and a long lunch.