There's nothing mysterious about these old temples. They were built around the same time as many cathedrals in Europe. These builders were knowledgeable. They already had crane, levers and a lot of manpower and animal power. A lot of these ancient buildings were also build by slaves.

I used to watch his videos simply because he shows interesting sites. But his analysis is far too often wrong.

Those corners can be made with a harder stone and some sand. Sandstone is very easy to manipulate, even with copper chisels. The impressive stuff comes from the basalt and other very hard stones we find at ancient structures.

An investigation that starts w/ cleaning that dirty old block would help.

I enjoyed the video and appreciate the post. I remember looking at a video a couple years ago and this guy went around the back of a smaller building on one of the massive complexes of huge buildings common in Cambodia and found an original wooden door in good shape with the original hinges - which, of course, should not be possible for 900-year-old wood in a wet and hot jungle environment.

We've been lied to.

"This is extrAdinary (sic) technology". It was considerate of him to film that with a 2007 Nokia N95 camera phone in 240p resolution.

That temple isn't very old and it's sandstone. If you want a real mystery, check out the Megaliths of Baalbek. It has perfectly cut 200 thousand ton granite blocks.

Geopolymer seems even more likely when you look at the stone walls of Cusco in Peru.

Only thing left to convince me completely would be an accurate recreation.