Aside from the memories of umpteen Ashes losses, the turf at Lord's Cricket ground rests above a series of disused railway tunnels. While we'd love to see them opened up for nighttime jaunts, smarter heads have proposed they be turned into a subterranean hospital. The £100m care centre would be attached to nearby Wellington Hospital, and include a suite of operating theatres and intensive care units. We'll leave the question of recuperating from serious injury while you're already (more than) six feet underground to therapists.
Thanks to Jo Montgomery for the tip