Thanks beebuster2000.
The Romans built some of their best stuff in dry cut stone without mortar — makes sense, because mortar crumbles away through weathering and, well, the Roman imperial maintenance crews haven’t been through in a while. :’)
http://weburbanist.com/2010/09/26/bridges-that-babble-on-15-amazing-roman-aqueducts/
http://en.wikipedia.org/wiki/Alc%C3%A1ntara_Bridge
from the article, which btw is an outstanding find:
One wonders how many of OUR civilization’s monumental architectural works will still be around two thousand years hence.
Good question. I dont think many of the motels, malls, fast food joints, or skyscrapers will last. the roads though, yeah, they will last. we do know how to build roads.