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An unusually shaped arch in Bayards Cove Fort in Dartmouth. This is a Grade I listed building which on the Historic England website is named as Bearscove Castle.

Historic England description
Small artillery castle, built to protect the town quay. Possibly 1509-10 on documentary evidence, it was certainly in existence by 1537. Local limestone rubble. PLAN: A platform cut into the rock enclosed by a thick curving wall projecting into the estuary. EXTERIOR: Thick rubble wall with a regular series of putlog holes. Doorway on northern side onto the quay (although, according to Freeman, the quay did not extend this far until 1839). It is a plain doorway with an irregular 2-centred arch head under a hoodmould. 11 splayed gunports externally rebated for shutters; they are designed for guns mounted on flat beds. Parapet mostly collapsed but the bottom courses remain, projecting slightly on a row of small corbels. INTERIOR: Unroofed. Remains of stone steps to wallwalk. Sockets for timbers in cliff to rear from old lean-to structures - the place was apparantly (sic) used for storage in times of peace. Bearscove Castle is sited at the end of a fine and picturesque row of listed buildings on the old town quay. (Archaeologia: O'Neil BH St J: Dartmouth Castle and other defences of Dartmouth Haven: 1935-: P.129-157; Saunders AD: Dartmouth Castle, Devon: HMSO: 1986-; Freeman, Ray: Dartmouth and its Neighbours: Phillimore: 1990-: P.54).
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