Cave of los Griegos Nature · Masegosa, Serranía Alta, Cuenca Image of Masegosa, not of the place itself. The Cueva de los Griegos is a karstic cavity of speleological interest located a quarter of a league from Masegosa (Serranía Alta, Cuenca), in an area of intense limestone dissolution close to the source of the Cuervo river. According to the historical description in Madoz's dictionary, it contains beautiful petrifications produced by water infiltrations. Photo: JHerranz (CC BY 3.0) What to see and do in Masegosa