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The Mail Rail in Clerkenwell is part of the London Postal Museum. It’s a unique, 100-year-old, underground railway, separate from the tube network, that was used to ferry post across the capital in the twentieth century. It eventually stopped running in 2003, but a decade later the Mail Rail reopened for visitors and now people can explore the tunnels on foot. This very exclusive guided walking tour gives access to the tunnels, tracks and station platforms of the railway. Expert guides will tell the story of the rail line – through peacetime and war – and no doubt offer a creepy anecdote or two, in case walking along a tunnel under millions of tons of London clay doesn’t provide enough of a frisson.