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T'reri Cereri north Wales.
Walk back in Time - new travel book reveals Britain's ancient places.
An explorer has travelled the length and breadth of Britain to document over 400 mysterious little known ancient sites.
Dave Hamilton ventured off the beaten track to uncover wild ruins which have stood for between 2,000 and 10,000 years.
He avoided famous sites like Stonehenge, instead focusing on little-known lost ruins scattered across the country.
His travels saw him encounter sacred tombs and caves, stone circles, Bronze Age brochs and Iron Age hillforts.