Festivities of invierno de Molinos Activity · Molinos, Maestrazgo, Teruel Image of Molinos, not of the place itself. Molinos's winter festival is held in a village beside the 126-hectare Monumento Natural de las Grutas de Cristal, which includes the Cueva de las Graderas with bat colonies and archaeological remains. Photo: jnerin (CC BY-SA 3.0) What to see and do in Molinos