Placentia

"In 1693 the French began construction of Fort Royal to guard the harbour at Placentia," the colonial seat that "from 1692 to 1811" formed the strategic heart of "the larger economic and strategic interests of France and Britain in what is now Atlantic Canada." "Castle Hill was ceded to Great Britain by the Treaty of Utrecht in 1713 and subsequently neglected in favour of other defences"; the ruins of "the 17th and 18th-century French defence works, the British blockhouse, as well as of both French (1692-1713) and British (1713-1811) occupancy" now form Castle Hill National Historic Site, looking down on the present-day town of Placentia. source

Synthesised from cited sources