most intersting post. the romans were astounding. visited thepantheon a few years ago and was stunned by it. it still awesome even after the later christioans mined it and modified it.
stuff the romans built still stands in perfect condition. i visited a roman aqueduct in segovia spain. even after 2000 years it still stood , you couldnt fit a knife blade between the huge stones cut to build it. all crafted without steel tools.
i think they had the internet though, so that was some help.
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