Polygonal masonry is a technique of stone wall construction. True polygonal masonry is a technique wherein the visible surfaces of the stones are dressed with straight sides or joints, giving the block the appearance of a polygon.

Norba, an ancient town of Latium (Adjectum), Italy. It is situated 1 mile northwest of the modern town of Norma, on the western edge of the Volscian Mountains or Monti Lepini. The town is perched above a precipitous cliff with a splendid view over the Pomptine Marshes below; the highest point stands to ca. 460 meters above sea level.