11 Facts About Castles That You Probably Don't Know: On average, it took about ten years to build a castle. Life in a Medieval Castle: Castles usually had only a few windows, which were very high up the walls to keep out the weather and any enemies.
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The height of walls varied widely by castle, but were often 2.5–6 m (8.2–19.7 ft) thick. They were usually topped with crenellation or parapets that offered protection to defenders.
A Royal home and fortress for over 900 years, Windsor Castle, the largest occupied castle in the world, remains a working palace today. Windsor Castle is used regularly for Investitures at which honours recipients receive their medals from a member of the Royal Family in the Grand Reception Room.
Dry stone, sometimes called drystack or, in Scotland, drystane, is a building method by which structures are constructed from stones without any mortar to bind them together. A certain amount of binding is obtained through the use of carefully selected interlocking stones.