Paris's Musée du Louvre was originally a fortress, built in 1190, to protect Parisians against Viking attacks. It had a moat protecting it from attacks as well as defense towers in all corners.

Paris’s Musée du Louvre was originally a fortress, built in 1190, to protect Parisians against Viking attacks. It had a moat protecting it from attacks as well as defense towers in all corners. – Tiny Fox Lab Facts

Image credit: Wikicommons
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