To see some of Spain's best cave art, including superb horse paintings probably done around 13,000 to 12,000 BC, visit this World Heritage–listed cave, a short distance south of the western end of the Sella bridge. Daily visitor numbers are limited so online or telephone reservations are essential. Even if you miss the cave itself, the Centro de Arte Rupestre Tito Bustillo , 200m along the road, is well worth a visit for its displays, video and replicas.
The one-hour visit (guided in Spanish) to the Cueva de Tito Bustillo includes some slippery stretches, and children under seven years are not admitted. Visits to La Cuevona , a separate, impressively large cave (though without art), are free with the Centro de Arte Rupestre ticket: up to 15 groups of 20 are taken in each day when the Centro is open. Enquire upon arrival at the Centro.