For centuries this rock was worth dying for, and its geography explains why. Siurana sits atop a sheer escarpment in the Prades Mountains, ringed by cliffs on nearly every side and reachable by a single narrow approach. Whoever held the summit could watch armies gather for miles and could not easily be pried loose. By the middle of the 12th century, the frontier of the Reconquista was collapsing across Catalonia. Tortosa fell. Miravet fell. Siurana held out longer than any of them. When it finally surrendered in 1153, it became the last Muslim enclave in all of Catalonia to pass into Christian hands, the closing line of a border that had split the region for generations. A memorial cross, raised on the clifftop in 1953 to mark eight hundred years since that day, still keeps the anniversary.

Names cling to Siurana like lichen to its rocks, and each one records a change of masters. In the Latin of the Romans, the settlement was Seviriana. When the Umayyads pushed up through the Iberian Peninsula and took these hills, the name softened on their tongues to Xibrana. The Christians who stormed the summit in 1153 renamed it once more, and Siurana is the version that endured. Three names for one outcrop, stacked like sediment, a small linguistic fossil record of everyone who ever wanted this improbable perch badly enough to climb it and hold it.

The drama at Siurana today is scenic rather than martial. The village is tiny: a scatter of stone houses and a weathered Romanesque church gathered at the very lip of the escarpment, just east of Cornudella de Montsant and within sight of the serrated ridge of the Serra de Montsant. Below the cliffs, the Siurana Reservoir pools in the valley, a sheet of still water that mirrors the sky and the red-brown rock. This is what draws most visitors: the long quiet, the vultures and raptors riding thermals off the cliff face, and views that fall away in every direction across one of Catalonia's most rugged corners. Getting here means a winding drive up through the Priorat, and the reward at the top is the simplest kind. In late afternoon the low sun sets the escarpment glowing, and the reservoir below turns from steel to copper.

The same cliffs that once made Siurana unconquerable now attract people whose entire purpose is to conquer them. The limestone here is exceptional, steep and pocketed and honeycombed with holds, and over the last few decades the crag has become one of the planet's premier sport-climbing destinations. Climbers arrive from every continent to test themselves against hundreds of bolted routes, among them La Rambla, a line so revered it belongs to the sport's short list of legendary pitches. In spring and autumn the village fills with vans, and the walls echo with encouragement shouted in a dozen languages. Much of that reputation traces back to Toni Arbonés, whose first ascents opened these cliffs to the wider climbing world. Once, the story of this rock was about the impossibility of the drop, a queen's last unanswerable leap. Now, one fingerhold at a time, climbers are busy writing the opposite story.