Worldbuilding
Old underground spaces do more than add atmosphere. Once a city has cellars, tunnels, crypts and sealed service passages, you start asking who can move through them unseen, who inherited the keys, and what was important enough to hide under the paving stones in the first place.
That seems to be where the real worldbuilding starts. Not with “there is a tunnel”, but with “why does this tunnel still matter, and to whom?”
A city with a buried history should behave like one. People remember routes. Families hoard access. Institutions deny everything, which usually means they know exactly where the door is.
That seems to be where the real worldbuilding starts. Not with “there is a tunnel”, but with “why does this tunnel still matter, and to whom?”
A city with a buried history should behave like one. People remember routes. Families hoard access. Institutions deny everything, which usually means they know exactly where the door is.
The awkward bit is that most buried spaces stop being mysterious the moment someone has to maintain them. A tunnel is not just a secret, it is damp, insurance, paperwork, a locked gate and someone with a torch on a rota. That practical layer can be more useful than pure atmosphere. It tells you which institutions are lying by omission and which ones are just trying to keep the roof from falling in.