The equivalent would probably be rather (literally) byzantine sewage and water systems from the middle ages in very old cities like Istanbul ;) They're everywh

The equivalent would probably be rather (literally) byzantine sewage and water systems from the middle ages in very old cities like Istanbul ;) They're everywhere, they do.. something.., and nobody can replace them just all at once. Even if you replace some of them, the remaining part still means your system gets swamped by the old mess.