Caravanserai in Dasht-e Lut.

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Caravanserais were found frequently along the Persian Empire's Royal Road, a 2,500-kilometre (1,600 mi) long ancient highway that stretched from Sardis to Susa.
Most typically a caravanserai was a building with a square or rectangular walled exterior, with a single portal wide enough to permit large or heavily laden beasts such as camels to enter. The courtyard was almost always open to the sky, and the inside walls of the enclosure were outfitted with a number of identical stalls, bays, niches, or chambers to accommodate merchants and their servants, animals, and merchandise.[2]

Herodotus: "Now the true account of the road in question is the following: Royal stations exist along its whole length, and excellent caravansaries; and throughout, it traverses an inhabited tract, and is free from danger."[1]