The visitor hut at a prehistoric stone circle has been burnt to the ground in what police say was an arson attack.
The hut, at the Rollright Stones on the border of Oxfordshire and Warwickshire, was completely destroyed in the blaze on Sunday.
It had been used to store visitor guides and merchandise.
Police said the fire was unrelated to an incident in March 2004 when 70 of the Neolithic stones were splashed with yellow paint.
Flames were spotted by a passing motorist in the early hours.
PC Tony Auden said the fire had “caused a significant amount of damage”.
He said arsonists had forced their way through a door and set the hut alight.
Dohn Prout, site manager, said he could not believe the Rollright Stones had suffered further “bad luck”.
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