I guess if you characterize devastating losses of culture, art, and technological knowledge as 'occasional dips'. Development of human societies has been along multiple concurrent paths, some taking huge declines, others rising. The general tendency has been towards modern civilization, but that's not to say that all societies have evenly progressed along one technological line largely uninterrupted. The medieval European dark ages weren't the only dark ages in human history.it is VERY interesting to me to speculate on how and why. What I wonder is this: current theories say that human civilization evolved in a fairly straightforward line from primitive to modern, with an occassional dip here and there...
That said, we'd still find evidence of cranes and other technology if they'd had them way back when. It's far less controversial to place log rollers among the list of technologies in the new world than to say that some bit of decorative art means they had airplanes and spaceships.
We've never found even one fragment of an 'ancient crane', nor any real evidence suggesting high technology.civilizations rise and fall but overall, the human race has steadily advanced...WE think WE are the most advanced civilization that has ever appeared on this planet and that our descendents will be more advanced than we are but maybe that isn't true.
It is and always was a myth. Plato created Atlantis as a philosophical statement about government and power, not an actual testament to the truth of what happened. The truth is that an actual ancient technological civilization would have left behind at least some fragmentary clues as to their existence. That's not present in the historical or archeological record. Neither is it possible they were creating one-off examples of high technology, because often these early societies show no evidence of modern social organization, nor evidence of advanced materials science. Why on earth would these societies focus on building cranes and airplanes and whatnot if they can't even build a mud brick hut safely? The very first thing people turn to when they get some technology is making their life easier, then the focus on going to war with it. We've found evidence of neither. This lack of evidence for basic, foundational technology almost certainly precludes the possibility of more advanced examples of machinery. There's no way that people limited to, for example, bronze forging were going to be able to create a usable crane capable of lifting multi-ton blocks. While yes, steel was produced by roughly 1500 BC (with some limited evidence of earlier production), it certainly wasn't used for much other than weapons. We do not find examples of steel bolts, nuts, nails, beams, cast steel machine parts, or any other uses of it. One lone steel valve would be enough to totally validate the possibility, but there's never been any evidence of that.Maybe history isn't quite so clear cut. Maybe we AREN'T the most advanced people that have ever evolved on this planet.. Maybe some time in the past a civilization as advanced or more DID evolve and DID fall for whatever reasons and all those stories of Atlantis are just primal memories?
These are the same sort of people who had their entire world revolutionized by things like an archemedes screw--that wasn't going to happen if they had enough knowledge of hydraulics to power cranes capable of lifting megalithic stones.
Any event that would wipe all trace of modern society off the face of the earth--every fragment of plastic, every shaped piece of steel, every titanium valve on an airplane--would be so devastating that it would be recent and in the geological record, and completely global. It would almost certainly wipe out human beings as a whole. We're talking mass destruction on the order of a large asteroid strike.just something interesting (to me at least) to consider...and if it happened to them..it could happen to us. There is no guarantee that we won't experience a cataclysmic (sp) event that will erase most of the traces of our existance from the earth.
Any cataclysm that would destroy all record of modern society would only do so because it would leave such massive record of itself.