34. Not Up to Code
When the Romans took over Byzantium and decided to make it a new source of power for their empire, they decided to do some massive renovations. It took the full might of the Roman Empire over six years to build on top of the foundations of old Byzantium. To save time and money, the Romans literally dismantled many Byzantium buildings just to reuse the materials to make new Roman buildings. While six years may seem like a long time, one wonders about the safety of an entire city built out of recycled material in such a relatively short time.