Thomas Wynn was nervous. The American War of Independence had begun the year before, and the Member of Parliament for Caernarfonshire could not stop thinking about the long, undefended coast at the foot of his estate. American privateers were already raiding the Irish Sea. So in 1775, on his own dime and with no official authorisation, Wynn built himself a fort. Squat, stone-walled, bristling with cannon, Fort Belan still stands on the wind-flattened tip of the Dinlle Peninsula - the only purpose-built fortification of the American Revolution anywhere on the eastern side of the Atlantic Ocean.
The location made strategic sense. The Menai Strait narrows here to roughly 35 metres, the choke point between Caernarfon Bay and the channel that runs the length of Anglesey. Whoever holds Belan controls the southwestern entrance to the strait. The tide enforces the geography twice a day, cutting the fort off from the mainland for hours at a stretch. Wynn, who would later become the first Baron Newborough, chose the spot because no enemy ship could slip past it. By the late 1780s his barracks were genuinely deployed against American privateers operating in the Irish Sea. Whether they ever exchanged fire is unclear; the fort's own historians enjoy the line that "no shots have been fired in anger from the fort." The cannons remain. The defended history does not.
The Wynn family kept the fort in the family, and in the 1820s turned it into something stranger: a private fortress for personal use. Major works between 1824 and 1826 added a small harbour for Spencer Wynn's steam yacht. The walls rise twenty feet of stone; the inner buildings rise slightly higher. A sheltered quadrangle sits in the centre, where peacocks once paced. At each end of the courtyard a fortified tower carries the two-headed eagle of the first Lord Newborough. Twenty-four cannons line the walls as a gun battery, ready to make a noise. Small two-storey houses along the flanks once served as officers' and privates' quarters. In the 1890s Freddie Wynn added a watchtower with a telescope, more nautical curiosity than military instrument. Local lore insists one inner corridor is haunted by the ghost of a phantom nursemaid.
By 1907, when Sir Ralph Payne-Gallwey came to describe the place, Fort Belan had become a working private dockyard - dock, workshops for repairing vessels, marine storehouses, winches, cranes. The fort had quietly converted from coastal defence into the most elaborate seaside garage in Wales. In 1969, Princess Margaret stayed at Belan for the investiture of Prince Charles as Prince of Wales at Caernarfon Castle, a few miles inland. The Wynn family finally let go in 1992, selling to the Blundells, who used the property as a base for marine biology exploration. Today the buildings serve as self-catering holiday accommodation, with the cannon battery still pointing out to sea - aimed at threats that never came.
What survives at Belan is a Grade I listed monument to a particular kind of British eccentricity: a private fort that took itself seriously enough to stand for two and a half centuries, watching a strait that needed no watching. Look at it from the air and the strategic logic is obvious. The Dinlle Peninsula juts west like a finger pointing at Abermenai Point on Anglesey; the gap between is narrow enough that on a calm day you can hear voices carry across the water. The cannons no longer fire. The tide still comes in twice a day, still cuts the fort off from the world, still arranges Belan into a small island for hours at a time before letting it back.
Coordinates 53.122°N, 4.333°W at the southwestern entrance of the Menai Strait, on the tip of the Dinlle Peninsula opposite Abermenai Point on Anglesey. Caernarfon Airport (EGCK) lies 2 km north on the same low coastal strip; the fort is unmistakable as a square stone enclosure at the very tip of land, often surrounded by water at high tide. The Menai Strait narrows to roughly 35 metres at this point - one of the most dramatic chokepoints visible on the British coastline. RAF Valley (EGOV) lies 25 km northwest. Best viewed at 1,000 to 2,000 feet with the tide either fully in (fort appears as an island) or fully out (the connecting sand bar exposed).