For those in power, something slightly sturdier was required to protect against invasion or uprising. This took the form of fortified castles, which evolved during the Middle Ages, and were originally built by Norman invaders in the UK to control conquered territories.

These castles were largely built of stone and were strategically erected on hills or other raised ground to maximize their potential for defence.

Pictured here is Eilean Donan Castle, a fortified castle built in the Highlands of Scotland in the 13th century.

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