The Stone of Twelve Angles, the Inca Palace of Hatunrumiyoc, Cuzco, Peru"The stone is in the Lienzo petreo wall, it is an excellent exaple of the Inca's skill with polygonal masonry"

Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

The Polygonal wall, a retaining wall built after the destruction of the old temple of Apollo in 548 BC, Delphi, UNESCO World Heritage Site, Peloponnese, Greece, Europe

The Polygonal wall, a retaining wall built after the destruction of the old temple of Apollo in 548 BC, Delphi, UNESCO World Heritage Site, Peloponnese, Greece, Europe

The Polygonal wall, a retaining wall built after the destruction of the old temple of Apollo in 548 BC, Delphi, UNESCO World Heritage Site, Peloponnese, Greece, Europe

The Polygonal wall, a retaining wall built after the destruction of the old temple of Apollo in 548 BC, Delphi, UNESCO World Heritage Site, Peloponnese, Greece, Europe