Police are appealing for information after Fountains Abbey on the outskirts of Ripon was targeted by vandals.
The incident happened sometime between 6pm on Friday (14th February) and 9am on Sunday (17th February) when graffiti was painted onto both the abbey and St Mary's Church.
As the paint used is oil-based, and has been applied to medieval plasterwork, it is likely to result in considerable damage to this Grade 1 listed structure.
Sergeant Danny Copperwheat from North Yorkshire Police’s Neighbourhood Policing Team said:
"This is an appalling act of vandalism on a world-renowned heritage site. North Yorkshire Police will not tolerate these types of acts, and our officers will work tirelessly to bring those responsible to justice.
"We want to hear from anyone who has any information about the people responsible for this mindless act.”
If you have any information that could help with the police investigation, or saw anyone acting suspiciously in this area at the time of the offence, please email danny.copperwheat@northyorkshire.police.uk.
Alternatively, you can call North Yorkshire Police on 101, and ask for Danny Copperwheat, or contact Crimestoppers anonymously on 0800 555 111 or via their website.
Please quote reference 12250029494 when passing on information.

Newly refurbished pub near Knaresborough named among best in UK
Ripon restaurant reopens under new ownership
New independent café to open in Knaresborough tomorrow
Dates revealed for 'new look' Harrogate Food and Drink Festival
Five men due in court after vehicle theft in Harrogate
Halloween half term success as thousands complete Harrogate monster trail
Harrogate bus firm offers free travel for Armed Forces
Harrogate estate agents scoop double gold at national awards
'Business as usual' for Windsor House tenants as business hub gets new owners
Asda unveils new-look Harrogate store after £2million refurb
Inspirational headteacher transforms 'inadequate' Harrogate school
Harrogate MP steps up campaign to save Rotary Wood
Inspectors full of praise for Harrogate primary school
Harrogate's free repair café to return next weekend
Council issues roadworks update as Tesco works near completion
Harrogate wins gold at Britain in Bloom awards
A life of service: From military nurse to Principal of a Harrogate school
Harrogate comedian to return to hometown as part of upcoming tour
Swimming instructors visit Harrogate nurseries to teach water safety
Charity lunch at Harrogate hotel raises £2,700


