Not if you actually look. Romans invented a concrete recipe that was lost for a millennium. Their ports were holding together longer than any modern concrete. T

Not if you actually look. Romans invented a concrete recipe that was lost for a millennium. Their ports were holding together longer than any modern concrete. This Roman concrete recipe was recently rediscovered and has been getting traction again. https://en.wikipedia.org/wiki/Roman_concrete#Modern_use https://en.wikipedia.org/wiki/Roman_concrete#Modern_use