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Thornton Abbey

Thomas de Gretham haunts this gatehouse and the remnants of the Abbey; it is said that he practised the black arts and was bricked up alive in the monastery dungeon. There are tales of a phantom monk, a man who walks across the parapet and then vanishes into a wall, and a spectral lady. Other spectral figures seen on the site are believed to be those who perished when Oliver Cromwell's men massacred everyone inside the gatehouse.

Link: Grimsby Live

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