Stone arch over the entrance to a battery in the lichen covered granite walls of the Garrison above Hugh Town. It shows how an arch works and illustrates the importance of the keystone. St Mary's, Isles of Scilly, UK. 16 September 2006.

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Stone arch over the entrance to a battery in the lichen covered granite walls of the Garrison above Hugh Town. It shows how an arch works and illustrates the importance of the keystone. St Mary's, Isles of Scilly, UK. 16 September 2006.

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arch architecture Barn Digital BarnDigital building castle construction defence defense force fortification granite grey historic history keystone lichen Michael Grant MIchaelGrantImages stone suspend tower wall
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