259 people joined the Ancient Order of Druids at ____ in 1905 (10)

I believe the answer is:

stonehenge

(Other definitions for stonehenge that I've seen before include "Wiltshire landmark" , "Wiltshire attraction" , "Prehistoric ruin, Salisbury Plain" , "[WILTS] monument" , "Wiltshire stone circle" .)

I've seen this clue in The Times and The Sunday Times.

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