As far as longevity goes, aren't large sections of the Great Wall made from soil with rolls of grass acting as a kind of re-bar? Believe I saw that on Discovery or NatGeo.
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.