The Greenway of the Sierra de la Demanda Activity · Pineda de la Sierra, Sierra de la Demanda, Burgos Image of Pineda de la Sierra, not of the place itself. The Camino Natural Vía Verde de la Sierra de la Demanda runs 52 kilometres between Arlanzón and Monterrubio de la Demanda (Burgos) along the bed of a former mining railway built in 1902, which carried ore from Barbadillo de Herreros to Villafría. The route, with four viaducts, one tunnel and a 380-metre drop in elevation, opened as a greenway in the early 2000s and is part of the Red de Caminos Naturales of the Ministerio de Agricultura, Pesca y Alimentación. It is maintained by the association of the six municipalities it crosses, among them Pineda de la Sierra; given the area's sparse population and limited municipal budgets, the route suffers from serious conservation problems. Photo: Unknown author (CC BY-SA 4.0) What to see and do in Pineda de la Sierra