Bayards Cove Fort

Bayard's Cove Fort, also known historically as Berescove or Bearscore Castle, is an English 16th-century artillery blockhouse, built to defend the harbour entrance at Dartmouth in Devon. Constructed in the early part of the century, it had eleven gunports for heavy artillery and was intended to engage enemy vessels that broke past the external defences of the Dartmouth and Kingswear castles. It remained armed during the English Civil War, but was neglected in the 18th century and used for storage. The fort was restored in the late 19th century and is now managed by English Heritage and open to visitors.

Source: Wikipedia