fortifications on Castle Harbour At Ferry Reach, on the north of Castle Harbour (an area now separated by the Causeway), Burnt Point Fort, or Ferry Point Battery (1688), and Ferry Island Fort (1790s) were built, and, much later, in 1822, a Martello Tower. The island chain across the south of Castle Harbour is often referred to as the Castle Islands. Their fortifications are the oldest surviving English New World fortifications (due primarily to their having been constructed of stone, whereas contemporary English fortifications on the North American continent were built from timber and earth). They were also the first English coastal fortifications in the New World. As a result of their historical significance, they have been made a UNESCO World Heritage Site, together with St. George's Town. Castle Harbour is the only breeding ground in the world of the famous rare seabird, the Bermuda petrel or cahow. The north of the harbour was altered considerably during the Second World War, when the US Army built a large airbase, Kindley Field, which is today the Bermuda International Airport. This involved the levelling of Longbird Island, and several smaller islets, and infilling waterways and much of the harbour to create a land mass contiguous with St. David's Island and Cooper's Island. References External links Geography of Bermuda Hamilton Parish St. George's Parish, Bermuda Martello towers World War II sites in Bermuda Ports and harbours of Bermuda