The concrete blocks that once protected Britain January 06, 2019 at 04:15PMhttps://https://bbc.in/2SFQceH Photographer Joe Pettet-Smith's pictures of the remaining sound mirrors that were once used to detect approaching enemy aircraft.
Photographer Joe Pettet-Smith's pictures of the remaining sound mirrors that were once used to detect approaching enemy aircraft.
from BBC News - World https://bbc.in/2SDSfQn
from BBC News - World https://bbc.in/2SDSfQn
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