Explore a secret abandoned wind tunnel in 360-degree tour
Abandoned and silent today, this hall once hummed with the sound of 120mph wind: the effect of a massive fan that could revolve at up to 250 times per minute.
The 360 degree view is awesome as it takes us in history .
Have a look at it http://www.bbc.com/future/story/20170919-the-abandoned-wind-tunnel-that-tested-world-war-two-aircraft
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STOP@gemsborg Really fantastic post.