This unexpected city was built on a rectangular grid behind a fortified wall—a glorious site amid the sandy desert http://on.natgeo.com/2lpiRpN

This unexpected city was built on a rectangular grid behind a fortified wall—a glorious site amid the sandy desert http://on.natgeo.com/2lpiRpN 

https://twitter.com/NatGeoTravel/status/947150368735100928