Polygonal masonry consists of stones that have five or more face angles, in contrast to ashlar blocks which have four rectangular ones.
In Greece, Cyclopean masonry was the first type of polygonal masonry. To fit the stones properly to each other, masons would utilize strips of lead to form templates of the already laid blocks, which were then used to shape the to-be-adjoined ones.
Sites Easter Island
Ahu Vinapu
Finland
Bomarsund Fortress
Greece
Delphi Keramikos Nekromanteion
Italy In Italy, polygonal masonry is particularly indicative of the region of Latium, but it occurs also in Etruria, Lucania, Samnium, and Umbria; scholars including Giuseppe Lugli have carried out studies of the technique.Frank, T. 1924. "Roman buildings of the Republic: an attempt to date them from their materials." MAAR 3. Some notable sites that have fortification walls built in this technique include Norba, Signia, Alatri, Boiano, Circeo, Cosa, Alba Fucens, Palestrina, and Terracina. The Porta Rosa of the ancient city of Velia employs a variant of the technique known as Lesbian masonry.
Japan
Akō Castle Fushimi Castle Nakagusuku Castle Nijō Castle Odawara Castle Oka Castle Osaka Castle Shibata Castle Shuri Castle Uwajima Castle
Latvia
Daugavpils
Malta Ħaġar Qim Megalithic Temples of Malta
Peru
Chinchero Chullpa Towers Coricancha Inti Watana, Ayacucho Ollantaytambo Raqch'i Saksaywaman Tambomachay Tarawasi Usnu Vilcabamba Vilcashuamán Wanuku Pampa Twelve-angled_stone
Portugal Quinta da Regaleira
Russia Königsberg Castle
Spain Castell d'Olèrdola
Turkey Hattusa
United Arab Emirates Hili Archaeological Park
References
P. Gros. 1996. L'architecture romaine: du début du IIIe siècle av. J.-C. à la fin du Haut-Empire. 2 v. Paris: Picard.