Other ancient cities in Jordan had tunnels (https://en.wikipedia.org/wiki/Gadara_Aqueduct https://en.wikipedia.org/wiki/Gadara_Aqueduct). These tunnels, which a

Other ancient cities in Jordan had tunnels (https://en.wikipedia.org/wiki/Gadara_Aqueduct https://en.wikipedia.org/wiki/Gadara_Aqueduct). These tunnels, which are thought to be originally from Iran but adopted by many cultures including the Romans, exist all over the world including in Luxembourg.