The two trapezoidal enclosures of Castrotorafe Monument · San Cebrián de Castro, Tierra del Pan, Zamora Image of San Cebrián de Castro, not of the place itself. The fortress was raised in slate masonry bonded with mortar and organises two enclosures of trapezoidal plan; the outer one preserves drum towers at the corners, later reformed for the use of artillery. Photo: Enrique.garzo.cano (CC BY-SA 4.0) What to see and do in San Cebrián de Castro