Roman site of El Beneficio Nature · Collado Mediano, Cuenca del Guadarrama, Madrid Image of Collado Mediano, not of the place itself. Declared a Bien de Interés Cultural in 2012, it preserves a mansio of the 2nd to 5th centuries with a common room, kitchen and baths heated by an outside furnace; it is identified with the Miaccum cited on road XXIV of the Antonine Itinerary. Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid (CC BY 3.0 es) What to see and do in Collado Mediano