How did such enormous and ancient monuments go undiscovered until the 21st century? Well, they were so friggin' old that time had actually covered them in a layer of dirt and foliage so thick, they looked like regular mountains. Clearly we're talking about the houses of the Old Ones here.
Or else they were just regular mountains.
There's a reason Osmanagic is an amateur archaeologist. On top of searching the world for hidden pyramids, his other hobbies include claiming that the Nazis "escaped to a secret underground base in Antarctica" and preparing humanity for the "cosmic vibrations" that were supposed to elevate us to a higher plane in 2012. He's basically the Ancient Aliens guy. We're sure he has some very interesting theories about 9/11 and chemtrails.
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Why do we get the feeling that "cosmic vibrations" was part of a pick-up line?
But that doesn't account for the fact that they really, really look like pyramids, right? There's the pointy triangle shape, the blocks that they're built from, and the fact that even regular archaeologists who aren't conspiracy theorists were fooled.
The answer is shockingly simple: The "building blocks" are just weak sandstones broken by tectonic stress to create the illusion of small blocks, and tougher stones are likewise broken into large blocks. It's all just natural stone with fissures and cracks, and it can be seen in formations across the world. Twelve thousand years ago, European man was capable of building only flimsy huts, as the actual archaeological evidence revealed, and which the Bosnian state, thankfully, acknowledged upon withdrawing funding. Governments are just like little kids sometimes -- they want to believe in the awesome fiction so badly that only when the X-Ray Spex show up in the mail do they begrudgingly admit they wasted their Popsicle money.
At least the kids would've enjoyed that they got a nice sledding hill out of the deal.