Here there are pictures of locks, that is fasteners used to close a door or a chain. Some of them are pretty new, others are old and rusted. You can see also lockers, compartments for personal object that are commonly found in public places like a railway station or a bank. Often lovers are used to putting a lock as sign of their love: it happens in Florence, close to Cellini's statue, and in Rome, at the top of Monte Mario or on Ponte Milvio.
photo -> object -> lock