Medieval roadside inns were spaced exactly one camel's walk apart
These stone fortresses acted as the world's first predictable logistics network, ensuring that a merchant's most fragile cargo never had to spend a night in the open wilderness.
The rhythm of medieval global trade was dictated by the biology of the dromedary camel. Across the rugged landscape of Anatolia, the Seljuk and Ottoman empires constructed a massive network of caravanserais, or 'camel palaces,' spaced at intervals of roughly 30 to 40 kilometers. This specific distance was no accident; it represented the maximum trek a heavily laden pack animal could manage in a single day before its endurance failed. By chaining these fortified hubs together, the state created a predictable, safe corridor that functioned like a biological clockwork, allowing silk and spices to move across hundreds of miles without the merchants ever losing the protection of a stone roof.