Tintagel, whilst a beautiful setting, has not a shred of evidence to support its claim to the legendary king but that doesn't stop the town capitalising on the possibility of course! Another Green World which is Peter Pracownik's shop and studio is well worth a visit if you like fantasy art and the Old Post Office is quite interesting. Otherwise just head down to the coastline and castle itself.
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Built around 1230 but with evidence of habitation dating back to Roman times the castle is now completely ruined.
It is a steep walk down to the castle ( you can pay an additional charge and be ferried by landrover) and once you are there you are faced with endless flights of steep steps back up but the views are worth it.
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Merlin's Cave is accessible from the beach ( more steps!) and the long climb up to the top of the island is rewarded by the remains of Edward of Cornwall's castle.
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Little is still standing, some of that being rebuilt aswell but the floor plans of mainly rooms/dwelllings can still be seen