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Come explore the rich history of computing during Heritage Open Days 2026! For this year's Heritage Open Days, step inside the world of computing history at The National Museum of Computing (TNMOC) with 25 free tickets available per open day! We kindly ask that you only book 2 free tickets per booking to give others the opportunity to book. Located on the historic Bletchley Park Estate, TNMOC is home to the world’s largest collection of working historic computers, from the codebreaking Colossus to the machines that shaped the digital world we live in today. Highlights: Explore interactive galleries featuring everything from WWII codebreaking to retro gaming. See Colossus, the world’s first programmable electronic computer. Experience hands-on computing history, from mainframes to microcomputers. Discover the fascinating stories of pioneers who changed the tech world. To celebrate Heritage Open Days 2025, we’re offering 25 free tickets per day on the dates that we’re open during the festival period. Advance booking is essential. What are Heritage Open Days? Heritage Open Days is England's largest festival of history and culture, involving thousands of local volunteers and organisations. Every year for 10 days in September it brings people together to celebrate their heritage, community and history. Stories are told, traditions explored, and histories brought to life. It’s offers the public a chance to see hidden places and try out new experiences – and it’s all FREE.

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