A new science centre developed on the site of war-time accommodation is being opened at Bletchley Park by the Science Minister Lord Sainsbury.
The park in Bucks became famous for the cracking of the Enigma code in WWII.
Bletchley Park Director Christine Large said: "This is the most exciting development at Bletchley Park for more than a decade."
The new Science & Innovation Centre is said to mark Bletchley Park's return to world-leading research.
Bletchley Park Director Christine Large, said: "The trust's mission is to build on the World War Two code breakers' legacy, drawing inspiration from the history."
More than 42,000 sq ft of former wartime accommodation has been refurbished to create offices and manufacturing workshops to provide up to 300 new job opportunities in the park.
The first company to be moved into the Science & Innovation Centre (BPS&IC) is Ceravision Ltd, which is designing a new type of light source.