Restoring the value of material heritage is the first step towards preventing its destruction. Apart from artistic heritage, whose conventional value is obvious, cities have a large number of minor, anonymous, prosaic constructions which have an enormous potential for reuse. There are noteworthy cases of obsolete infrastructures (bridges, tunnels, deposits, industrial artefacts) which can have their value brought back by means of functional reprogramming and some material preparation, taking advantage of the intrinsic possibilities of constructions not conceived for containing inhabitable spaces, but which have outstanding structural and spatial qualities. Their reuse constitutes a further stratum of cultural significance which may enrich and give complexity to local history and heritage.