Trwyncastell Promontory fort from the air
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aerial photograph of Trwyncastell Promontory fort in the Pembrokeshire Coast National Park, Abereiddy , Wales. The fort consists of two lines of ditches and ramparts which seperate it from the mainland. The 18th century Abereiddy Tower is built within the fort. Above the fort is the Blue Lagoon, a former quarry pit which is now popular bathing spot.