Ossuary of the Las Arnillas dolmen Curiosity · Valle de Sedano, Páramos, Burgos The excavations directed by Germán Delibes de Castro brought to light a communal ossuary with the remains of fifty individuals and, separately, thirteen skulls; the studies calculate that the dolmen was in use for a thousand years. Photo: Ángel M. Felicísimo from Mérida, España (CC BY-SA 2.0) What to see and do in Valle de Sedano