Using stones weighing as much as eight tons each, Roman engineers built arched bridges that were so skillfully designed that some of them are still standing after more than two thousand years.
Nii ehitasid Rooma ehitusmeistrid kuni kaheksatonnistest kividest kaarsildu, mis olid konstrueeritud sedavõrd oskuslikult, et mõned neist on säilinud meie ajani, rohkem kui kaks tuhat aastat.