Rock Art of the Martín River between Alcaine and Obón Nature · Alcaine, Cuencas Mineras, Teruel The río Martín cave paintings between Alcaine and Obón form part of the rock art of the Mediterranean Basin of the Iberian Peninsula, declared a World Heritage Site by UNESCO in 1998. In the municipality of Alcaine are the shelters of Higuera del Barranco de Estercuel and Cañada de Marco, and in that of Obón those of El Cerrao, Hocino de Chornas and La Coquinera, listed among the sites with Levantine art in the province of Teruel. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Alcaine