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Pic: LillicrapChilcott/BNPS
A modern home built on a scheduled ancient monument is on the market for £1.55m.
The Round Field is on a fortified hill fort thought to date back 1800 years that was described as 'the most perfect round in the district'.
Estate agents Lillicrap Chilcott say it is a unique opportunity as such a property would be unlikely to ever get planning permission today.
The four-bedroom bungalow in Mawnan Smith in Cornwall is completely secluded from neighbours and has views of the coast.