Sir, there's not enough hours in a day for me to tell you how VERY wrong you are.....
I have personally been to many of these megalithic sites around the world, I have investigated them at length, and I am WELL aware of what mainstream archaeology tells us about the age of these sites.
If you ever get a chance to travel to any of these sites I encourage you to do so, and you can see for yourself 2 very different levels of technology which indicate 2 very different timelines. Machu Picchu for exampe..... yes, the Inca settled there in the 1500's, and their construction is clearly evident with the level of technology they had, however please don't for a second think that the Inca built the entire site of Machu Picchu. The megalithic stone construction with multi ton blocks precisely fit together indicates a different level of technology, and a different timeline. It's this megalithic construction that is found in various sites around the world, indicating the same level of technology and even possibly the same builders. So please don't spew off what you read on google as if it's fact, and please do your OWN research. Too many people just like yourself piggyback on the work and writings of others without investigating for yourself and drawing your own conclusions. I'll add 2 pics here from the same site to illustrate my point. As for the 12,000 year timeline, I'll leave that up to you to figure out, it's a tremendous journey, and I hope you are able to see it some day. Here's another tip, the great sphyns is MUCH older than you have been told, likely from the same timeline.
I wish you well on your search for the truth, Your life will become exponentially more interesting the moment you stop believing EVERYTHING you are told from a young age.... Good luck in your search, my time is far too valuable to engage in this banter any longer. I wish you well!