The theme for this year's Heritage Open Days is routes, networks and connections.
Medway Archives Centre is holding a free drop-in about Medway's tunnels. The drop-in includes the opportunity to see a blueprint of the tunnels at the Short Brothers Seaplane Works, which was based at Rochester Esplanade.
Call in to find out more and discover the hidden history beneath our feet. It's free, there's no need to book.