What are the chances of any our own very very ancient Earth civilization had had more advanced technical space travel vehicles than that we belong today ? Had they ever been into deeper space than we are not upto it today also?
The problem with vague ancient accounts is that pareidolia kicks in. We start seeing what we want to see in the hints and clues. It is best to be skeptical of our own minds deceptions.
To give this more perspective, Johannes Kepler wrote a fictional account of his travels to the Moon. In his story, he used a magic spell from his mother. But Kepler was aware that this was fiction and intended it to be such.
Bruno also wrote about his travels to space. He described his astronomical ideas with pretty good accuracy that was far beyond that of his day. In his account, it was a dream state that gave him this awareness. But Bruno did not claim magic nor alien machinery, rather he cited the power of gaining knowledge and God as his vehicles. He traveled without his body.
Keplers mother was imprisoned for witchcraft as a result of his story and Bruno, ever the rebel, was burned alive as a heretic.
And Voltaire... well... LOL. Voltaire is one of my favorite authors of fiction and satire from back in the day.
Works of fiction that give fanciful descriptions of amazing feats are not lost to the old ages.
Today we have Star Trek that depicts matter/antimatter flow in a glowing blue chamber, Firefly with a spinning orb like machine that puts out a great deal of light and various other unobtanium driven vehicles. Since the mechanics of it are less important than the plot, the mechanism is often overly spectacular but without detailed functional description. Just the same as now as it was back then.
Reasons given as to why the author does not describe are often given as the form of ignorance (The author does not know how it works), classified or forbidden (The author is not allowed to tell), unimportant (They could tell and would tell but it never comes up, it is simply just accepted) and so on.
But that is only to add to the believably of the story to make it more enjoyable.
As to whether or not there were ancient civilizations on Earth or visiting civilizations: There is No Evidence of it.
Perhaps we have been visited. Perhaps an ancient civilization rose on Earth and fell, many millions of years ago and the eons of geographical change have erased the evidence. But without any evidence, speculation of it is fiction. It can be enjoyed, but not believed.
It is quite possible that these have happened but the spans of time between those events and us could not have allowed any evidence to survive. It is unlikely, but not impossible.
And Atlantis... no evidence, there, either. Perhaps a fable. Perhaps it was a real place that like the seafaring Polynesians or the Ancient Minoans was more well traveled and beyond their more isolated contemporaries.
While the capitol of Ancient Rome was an amazing place of high technology, many provinces within the Roman Empire had no knowledge of that technology and would have been astounded by a trip to the Capitol. They may have believed Rome to be a Magical World of wonder. Because of indoor plumbing that the Romans took for granted.
Extraordinary claims require extraordinary evidence.
Without evidence, ancient civilizations and visitation resemble the myths that still pass around today. A quick reading on Snopes of many current myths will quickly disabuse a reader of how honest stories often are. We cannot readily believe or accept at face value without further examination.
But to ENJOY the stories? I believe that is the basis of interest on science. The Need To Find Out.
--Inter Arma Enim Silent Leges--
“Science needs the light of free expression to flourish. It depends on the fearless questioning of authority, and the open exchange of ideas.” ― Neil deGrasse Tyson
"When photons interact with electrons, they are interacting with the charge around a "bare" mass, and thus the interaction is electromagnetic, hence light. This light slows the photon down." - BuleriaChk