From the Beeb:
Bletchley Park: No longer the world's best kept secret
Bletchley Park was once the world's best kept secret and a key part of the country's war effort against Germany.
Every detail about the sprawling Buckinghamshire estate was shrouded in mystery as German Enigma codes were cracked using the Bombe machine.
Until wartime information was declassified in the mid-1970s, no-one who worked at the home of the Government Code and Cypher School was allowed to talk about it.
Without the story being told, the damp and dilapidated huts fell into disrepair and reached the point two years ago where they were almost beyond salvage.
Now, following a painstaking restoration, they have been brought back to life and Wednesday's official opening by the Duchess of Cambridge marks a remarkable turnaround from top secrecy to world wide attraction.
The Bletchley Park Trust was set up 22 years ago and began a race against time to save the mostly wooden structures, rapidly assembled in 1939.
Some interesting problems with the restoration:
Trust chief executive officer Iain Standen said historical integrity was "hugely important" and the buildings were now as near to original as possible.
"Everywhere we can we've used the original material that was here," he said.
Hut restoration was also threatened by the very nature of the centre's war work - secrecy.
With no photographs of the insides to work with, Bletchley Park looked to its most valuable resource - the veterans.
And it is their once silent voices which have allowed the buildings to come alive again.
Their testimonies mean that today's visitors see what each building looked like during the war - right down to the correct paint colour, thanks to a specialist historic paint analysis company.
When you enter a hut, it looks like code-breakers have just left the room.
Wonderful - this is a major site for the beginning of computing. The military codes were the best of the day and the fact that the British could break them within hours was a major benefit. Something to remember is that each transmission from the Enigma machine used a different code -- they were changed with a one-time pad and were considered to be unbreakable.
If we ever go overseas, Bletchley Park is on the top ten list of places to visit...
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