or caravanserai Public building used for sheltering caravans and other travelers in the Middle East. The structure is quadrangular in form and enclosed by a massive wall that has small windows near the top and a few narrow air holes near the bottom. The central court, surrounded by an arcade and storerooms, is usually large enough to contain 300-400 camels. It is open to the sky and has a well with a fountain basin in its center. There are rooms upstairs for lodging