A medieval stained glass window has been broken at Lincoln Cathedral.
It is thought the window was broken from the inside by an intruder trying to get out after the building had been locked up for the night.
A woman rang police to say she had seen a man climbing through the window at 1740 GMT on Sunday.
The window can be repaired, but the cost is expected to run into thousands of pounds. Police are appealing for witnesses to come forward.
They particularly want to speak to the woman who made the call.
A police spokesman said the intruder would have jumped about 15ft to 20ft (4.6m to 6.1m) to the ground below.
John Campbell of Lincoln Cathedral said: "The damage is considerable, some very fine medieval glass has been lost.
"Some of it can be retrieved but not a lot of it, so we've got to replace the windows as best we can.
"And thank goodness we've got staff on the cathedral team who will be able to do that."
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