I agree with Laura that this speak to the talent and ability of the Roman Empire.
You can still see many Roman influences in modern society. For example The Pont Du Gard is mimicked in many bridges such as the Riatlo Bride located in Italy in 1181 and The London Bridge in Lake Havasu City Arizona. Additionally, most of Washington DC’s government building draw there inspiration from Romain Temples such and the Temple of Portunus. Finally the famous Arc de Triomphe in Paris France bears a striking resemblance to the Arch of Titus.