These walls are no more suitable for protection, so such cities have grown beyond their walls, and many fortification walls, or portions of these, have been torn down—as an example in Rome, Italy and Beijing, China. Examples of protective walls with a much larger scale consist of the Great Wall https://centuradecor.com/transform-your-space-with-wallartt-co-uk-elevating-decor-with-exquisite-oil-paintings/