I’ve come across the BBC Future website, which it says is for the insatiably curious.
The website has an article on ‘The lost tunnels buried deep beneath the UK‘, which are definitely a surprising curiosity. The article says it’s about,
A vast network of 200-year-old tunnels lies beneath Liverpool’s streets – and no one knows why they’re there.
I’m sure you’d like to know more about the tunnels, well, here’s where you can find out more,