The National Science Museum’s Inspired exhibition aims to provide school parties with residential science trips by restoring an old airbase in Wiltshire.
An Inspired spokesman said: “Inspired is a critical project for the nation’s heritage and for attracting the next generation of scientists and engineers to combat the pressing issues of our time.”
They added that they would now be looking at alternative funding routes.
The announcement leaves a final shortlist of four projects.
The Black Country Urban Park will involve extensive opening up and stabilisation of enormous limestone caverns underneath Dudley as well as a 19.3km ‘green bridge’ park linking Walsall and West Bromwich town centres and widespread regeneration of Wolverhampton’s canal network.
The Sustrans Connect2 project will create cycle crossings and bridges over busy roads, railway lines and rivers nationwide, linking into new networks of local paths.
As well as new creating new structures, existing structures will be renovated such as the Brunel swing bridge in Bristol.
A climate change centre at the Eden Project in Cornwall and a restoration programme for Sherwood Forest make up the shortlist.
Each project will be the subject of a television programme on ITV1 in the week commencing 3 December. This will be followed by a public phone and online vote to determine which scheme will receive the one off award of £50M.