Harmondsworth Great Barn
The Harmondsworth Great Barn holds the distinction of being the largest timber-framed building in England. It was repaired and eventually bought over by English Heritage. It is now open to the public two Sundays every month from April to October every year.
Harmondsworth Great Barn is 
on the Map of Historic Buildings of London
The interior of the Harmondsworth Great Barn
Source: https://commons.wikimedia.org/wiki/File:Harmondsworth_Great_Barn_interior_looking_north.jpg
Author: Prioryman
List of Historic Buildings of London
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