The Monteriggioni castle, at the top of a hill planted with vineyards and olive trees, was founded in the second decade of the thirteenth century by the Republic of Siena, with the aim to create a defensive outpost against Florence, its rival.
The town walls made of stone have a linear development of about 570 meters.
The grandeur of the Towers, fourteen with a rectangular layout and one set against the inner curtain, suggested to the poet Dante Alighieri a popular similarity with the Giants placed in Inferno:
“[…] As with circling round / Of turrets, Monteriggioni crowns his walls; /E’en thus the shore, encompassing the abyss, / Was turreted with giants, half their length / Uprearing, horrible, whom Jove from heaven / Yet threatens, when his muttering thunder rolls. […]” (Inf., XXXI, lines 40-44).
The gate directed towards Rome is the main access to the village.