Tiermes, the city carved into the rock Curiosity · Montejo de Tiermes, Tierras del Burgo, Soria Image of Montejo de Tiermes, not of the place itself. The Celtiberian inhabitants carved their houses into the red sandstone of the hill, fitting dwellings one above another and joining them with stepped ramps. Even a tier of seating cut into the stone is preserved, of disputed function. Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in Montejo de Tiermes