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[–] Far2Long2 1 point 2 points (+3|-1) ago 

They're gargoyles, designed to ward off evil spirits and drain rain water off the stone to prevent water erosion of the mortar.

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[–] slwsnowman40 ago 

Which is funny because the mortar is virtually untouched after all that time.

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[–] Far2Long2 0 points 2 points (+2|-0) ago 

Which proves they work. Mediaeval builders knew what they were doing.