Located in the province of Catania, in the Italian island of Sicily, is the town of Grammichele. It is one of the few towns in the world to have the unique hexagonal layout.
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The town was founded after the great Sicily earthquake of 1693 wiped out an earlier settlement called Occhialà, located to the north of modern Grammichele. The survivors built a new town and named it Grammichele, after St. Michele, in the hope that the saint will protect the new town from further disasters.
Source: amusingplanet.com