Dr Jonathan Foyle, architectural historian and novice climber, scales Britain's most iconic structures, to reveal the buildings' secrets.

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The next step of Jonathan's journey takes him to Lincoln Cathedral, built in 1183. Once the tallest building in Britain, Lincoln Cathedral is one of the finest examples of gothic architecture in Britain.
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The next step of Jonathan's journey takes him to Caernarfon castle, built in 1283 and one of the most magnificent examples of medieval castle building in Britain.