Celtic hillforts developed in the Late Bronze and Early Iron Age, roughly the start of the first millennium BC, and were used in many Celtic areas of central and western Europe until the Roman conquest. They are most common d… See more

In Galicia, Asturias, Cantabria, Basque Country, province of Ávila and Northern Portugal a castro is a fortified pre-Roman Iron Age village, usually located on a hill or some naturally easy defendable place. The larger hillfor… See more

Similar structures can be found elsewhere in the world, such as the Hill Forts of Rajasthan.
In the Philippines, the Ivatan people of the Batanes Islands built ijang—fortified villages on top of n… See more