Fort Belan - Credit: Wikimedia Commons
Fort Belan (alternative: Belan Fort; pronounced: Bell-ann) is a coastal fortress in North Wales. It is located opposite Abermenai Point, at the south-western end of the Menai Strait, on the coast of Gwynedd, in the parish of Llanwnda. Situated at the tip of the Dinlle Peninsula, the windblown, north-westernmost point of the Welsh mainland, the fort is cut off twice a day by the incoming tide. Read more on Wikipedia
Source: en.wikipedia.org