Ackergill Tower (or Ackergill Castle) is located on the coast of Sinclair’s Bay, about 4 km north of Wick, Caithness, in northern Scotland. It was built in the early 16th century, and is a category A listed building. The building is a five-storey oblong tower house. The four-storey wing to the rear was added in the early 18th century.
Nicolle Tower, St Clement, Jersey
Fort Clonque is the most remarkable of the great mid-Victorian harbour works off Alderney, built to protect the Channel Islands from capture by the French. Perched on a group of large rocks surrounded by the waves, you reach the Fort by a spectacular causeway leading to a drawbridge.
Fort Clonque, Clonque Bay Alderney GY9 3UT