History of Bridges

Bridges were simple structures that were built from natural resources because they were easily accessible.
These natural resources include; wood, stone, and dirt.
The first bridges could only span short distances as the structures were not that strong as they used dirt in place of mortar as it was not invented yet.
In Ancient Rome it was discovered that grinded out volcanic rocks were good material for making mortar.
This changed the design of bridges as they were not limited to such low structural integrity and much sturdier, powerful and larger bridges began to be constructed after this discovery.