This is Bletchley Park, the once top secret home of the Second World War code breakers and birthplace of modern computing.

Here, the extraordinary achievements of thousands of men and women help save countless lives and had a direct influence on the outcome of the wall.

Discover this award-winning museum, uncover incredible stories, exhibitions and interactive displays.

Open daily, pay once and return as often as you like for a whole year.

Kids under 12 go free. Book your tickets at Bletchley Park.org.

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Welcome to the History Extra Podcast, Fascinating Historical Conversations from the

makers of BBC History magazine.

In 1851, a spectacular showcase of the world's best art, design and innovation opened in London. Housed in a magnificent Crystal Palace constructed by Joseph Paxton in just five months.

The Great Exhibition wowed its six million visitors and its legacy still lives on in London's

Museum District today. To find out more about this era defining event I spoke to Caroline McCaffrey Howarth, a lecturer in British art

history at the University of Edinburgh. Thanks so much for joining me, Caroline, to talk about

the 1851 great Exhibition. So before we go any

further for anyone who isn't familiar with it what was the Great Exhibition.

Why was it such a big deal in Victoria Britain?

Yeah, well I think the key thing to say first up is that it wasn't always called the Great Exhibition.

...