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The greatest ancient defensive work ever built is the Great Wall of China, which was begun in the 3rd century bc to defend China's northern frontier from its barbarian neighbours.
Weighing in at a staggering 21,196 kilometres long and with over 2,300 years under its belt, the Great Wall is the world's most awe inspiring feat of ancient defensive architecture, built by multiple dynasties to protect different territorial borders.
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Hadrian's Wall, an ancient Roman defensive line against the peoples of what was, in large part, to become Scotland, extends east-west along the northern edge of the Pennines.
Evidence exists of an ancient contest between offensive and defensive weaponry, with defensive weaponry at first leading the way.
In 2003 the ancient city and its numerous defensive structures were made a World Heritage site.
It was spread along a narrow mountain ridge with deep, jungle-clad gorges on either side, a location chosen for defensive reasons in ancient times.
Adding to the visual bleakness, the surface is littered with debris from the Iran-Iraq war when the city's ancient fortifications were reused as defensive earthworks by the Iraqi army.
While the concept of ditches, ramparts, and stone walls as defensive measures is ancient, raising a motte is a medieval innovation.
Guwahati, which enjoyed a strategic position throughout history due to its geographical location along the mighty Brahmaputra River and its defensive topography, has an ancient tradition of urbanisation.
The Newcastle town wall is a medieval defensive wall, and Scheduled Ancient Monument, in Newcastle upon Tyne, England.
The other is antimicrobial peptides which are important defensive molecules of the ancient innate immunity[ 8].
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