The Great Pyramid Doors
If you think you have heard it all, the entrance doors to the pyramids are estimated to weigh an incredible 20 tons, and you could push them open with one shove. Of course, the mind rebels at the thought of a human being able to open a 20-ton door with only a single push. But this is a testament to the incredible construction.
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These doors were constructed with such precise balance that it would be possible for you to open them in one shove. The doors were first discovered in the 1800s during the Great Pyramid exploration, and it took very little effort to open them. This begs the question, how did this ancient civilization create such perfectly balanced doors with no advanced technology?