Claigan Souterrain

Location: Claigan, Isle of Skye

Open: All year

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Clearwell Caves

Location: Royal Forest of Dean, Gloucestershire

Open: February until October

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Hellfire Caves

Location: West Wycombe, Buckinghamshire

Open: All Year

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Ingleborough Cave

Location: Clapham, Yorkshire

Open: February to End of October

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Mother Shiptons Cave and the Petrifying Well

Location: Knaresborough, Yorkshire

Open: February to October

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