Depends on if we can still contact the aliens that helped make the originals.
Even the ancient Egyptians moved on to easier (if less lasting) construction techniques. Middle Kingdom pyramids were made mostly of rubble stiffened with retaining walls and only faced with solid stone.
A lot of the construction of the Ryugyong Hotel was, coincidentally, done by an Egyptian company.
Yeah, I know, but never let the nuances and qualifications required by any scientific and academic discussion or interpretation of historical fact and sources get in the way of a joke, that’s what I always say.
Besides, slave or freedmen, they still got to pull 2-10 ton blocks of stone up a gorram mountain. In the Saharan desert. Walking sideways, too (:)). I shouldn’t expect it to have been a very pleasant or safe job.
Those who doubt a modern government would build something as silly as a pyramid need to visit Memphis, Tennessee.
Right. Which is why I changed positions, but my posts may have been unclear. $5 billion sounded like a PROHIBITIVE sum to me, until I saw that new skyscrapers cost around $4 billion. I think it’s possible, anyway, if someone wanted to try.
Cheaper just to have an inflatable duplicate: - YouTube
Like the Apollo program all the drawings were destroyed and the original contractors are no longer around. So no.
The real question, of course, is what amazing stuff you would bury with your dead body in the heart of it … and what awesome tricks and traps you could make to protect all that junk (and your body).
I bet with modern tech, you could design some amazingly cool traps! Though they would have to stand the test of time.
I’m curious as to the basis for the OP’s doubt that it could be done today.
To some people, it’s somehow enjoyable to believe that despite all of our current vaunted knowledge and technology, e.g. moon landing, etc., the ancient peoples could amazingly do something we have absolutely no means of duplicating today. Perhaps it helps justify their beliefs in certain ancient myths that contradict modern scientific theories. (Not saying this is true of the OP.) Certainly it can lead to all sorts of woo, such as hypotheses of visiting space aliens, for one example.
Of course it’s all rubbish. If we needed to, of course we could build new great pyramids, huge ass blocks of stone and all, or any other wonder of the ancient world.
There untold thousands of folks who, today, will be working, cutting down trees*, removing loose rock from above highways*, etc, etc hanging from the ends of ropes. As long as it’s done right OSHA has absolutely no problem with it.
*Both of which have had TV series showing the work being done.
On a mountain right next to Mt. Rushmore they’re working on this, the Crazy Horse Memorial who’s final planed dimensions are an order of magnitude larger than Rushmore.
CMC fnord!
That limit is pretty high. This crane is good for 20,133 metric tons; that’s a cube of limestone 66 feet on a side, far larger than anything the ancient Egyptians moved. Granted, that’s a pretty specialized crane, something not easily transported to a worksite.
The heaviest of the blocks in the great pyramid of Giza is only 80 tons. This website shows self-propelled cranes with capacities up to 200 tons. In other words, no problemo.
Could we afford to build a pyramid? Sure. I doubt you’d be able to find a group of investors who were willing to contribute to the venture, but any random lunatic with a few billion dollars lying around could easily afford to foot the bill if they wanted to.
Absolutely! We just have to ask the greys and who else to help us out again!
The Saturn V blueprints were not destroyed.
But there’s no reason to build a Saturn V rocket, nor an Apollo capsule. Why would we want to use core rope memory when we have chips that are better, lighter, cheaper, and hold more data? Why would be use thousands of transistors and breadboards when we can put all of the components on a chip? (And it may be difficult sourcing 1960s components anyway.)
We’d be better off building a new system.
There are also a bunch of pyramids at the white house… smaller ones
We don’t want to re-build the Saturn V, but we do want to be able to use it as a basis for the new rockets we build. Some parts of it, we can improve, but some parts we got right the first time.
Still, skyscrapers and dams are useful. There’s a return on investment. A replica of the Great Pyramid would just kinda… be there. It’s what the Victorians would call a folly: something you built just for the hell of it.
Well, where else are we going to store my mummified body and treasure, but in a giant pyramid? 
Not to hijack, but…
Apparently the F1 engine was very well done the first time around, but NASA actually laser-scanned an existing one and has reengineered it to have less parts and more power, as well as being lighter.