In brief
The serial object connects different places serving the movement.
Useful to know
The Chanan-Tianshan Corridor on the Silk Road is a serial site with multiple components. UNESCO includes city remains, palaces, religious sites, passages, post offices, fortifications, and signal towers. [1]
The general theme is the route and its functions. When viewing a map, separate the locations for management, protection, exchange and stay. The different type of buildings is not a random variety: it shows what it took for a long trip. Do not present the serial object as a continuous preserved road or as a single building ensemble with a common date.
Sources
For further detail and to check the information: