Final answer:
The Mehmed Paša Sokolović Bridge in Višegrad, Bosnia and Herzegovina, built by Mimar Sinan in 1577, is a standing bridge from historical royal roads and a UNESCO World Heritage site.
Step-by-step explanation:
In what country is a bridge from the royal road still standing? The Mehmed Paša Sokolović Bridge, which still stands today, is located in Višegrad, Bosnia and Herzegovina. This historic bridge was constructed by the renowned Ottoman architect Mimar Sinan in 1577. It is a notable example of Sinan's work and of Ottoman engineering, and it has been recognized as a UNESCO World Heritage site since 2007. Bridges like these were instrumental in connecting various parts of empires, facilitating the movement of messages, money, and troops, and increasing the area over which an empire could exert influence.
The Mehmed Paša Sokolović Bridge is one such bridge that was part of a larger network of roads and bridges, including the Roman and Qin empires, that were crucial for administration and control. The Romans were well-known for their advanced road and bridge construction techniques, and they had bridges such as the one in Alcántara, Spain, as well as paved roads in places like Petra, Jordan. The Qin Dynasty in China also built extensive road networks with remarkable bridges, indicating the importance of such infrastructure in the history of civilizations.