Sites of the Calvero de la Higuera Curiosity · Pinilla del Valle, Sierra Norte, Madrid A group of caves and rock shelters in the Lozoya valley with Neanderthal remains dating from between 100,000 and 40,000 years ago; in the Cueva Des-Cubierta the jawbone of the so-called girl of Lozoya was found, along with an accumulation of about thirty-five skulls of large herbivores. It comprises five main sites -Cueva del Camino, Abrigo de Navalmaíllo, Cueva de la Buena Pinta, Abrigo Ocelado and Cueva Des-Cubierta-, formed in a karst system where some cavities served as shelter for Neanderthals, among them the largest Neanderthal camp in all of Europe, while others were hyena dens. They were declared bien de interés cultural (Spain's highest level of heritage protection) on 23 December 2004, under the designation Zona Arqueológica y Paleontológica Los Calveros. Photo: Cruccone (CC BY 3.0) What to see and do in Pinilla del Valle