I think the programme was one of those Ancient Aliens type of programmes, as mentioned in other replies.
So it was nonsense, then. Something on a comedy fantasy show dressed in the facade of a documentary.
But it did show the actual rock hollowed out. To be fair I don't think its enough to assume others can do it when nobody else has done it. But if someone can show me a hollowed rock done by a modern machine I'll retract my hollowed rock theory.
To be fair, I don't think it's enough to expect others to believe that something you say was once on a show hilariously famous for nonsense is proof of aliens who (for some unexplained reason) hollowed out a rock ~4500 years ago.
But I'll pretend to accept, for the sake of argument, that this thing actually exists.
The first problem for your "it was aliens" argument is that you provide no details. Not even enough details for anyone to start trying to look into it, let alone the important details such as its size, what type of rock it is, how big the hollow is, how thick the crust is, how (ir)regular the shape is, how you know it's hollow, how people ~4500 years ago knew it was hollow.
The second problem for your "it was aliens" argument is that off the top of my head and with no relevant knowledge of modern machining capabilities I can think of 3 other explanations for a hollow rock whoch don't require modern knowledge or technology:
1) Make a blob of wax. Coat it with cement or concrete, leaving a small hole. Wait for the stone to set. Heat the stone and the wax melts and runs out the hole. Fill the hole with some more cement or concrete. There you go, a hollow stone. You could make a hollow stone with a pretty thin crust and completely hollow right the way through. You could even make a very regularly shaped one. You could also use processed solidified animal fat instead of wax. It would probably be easier to get enough of that than it would be to get enough wax. You could use earth and wash it out with water afterwards rather than melting it out. That would be time consuming, but many things were in the stone age. In case anyone is wondering, cement and concrete are stone age inventions. Concrete is commonly associated with the Romans in the iron age, but they didn't invent it. What they invented was a much stronger form of concrete, the infrastructure required to mass produce it and the architecture to make impressive use of it.
2) Find a naturally occuring hollow stone. I thought I remembered that they did exist and for some reason the relevant word came to me while I was having a shower. Geode. A stone with some other minerals in it and a hollow inside it. So you don't even need "a hollowed rock done by a modern machine". You can buy them online, from numerous places. They're not even particularly rare!
https://en.wikipedia.org/wiki/Geode
You can also get hollow stones that don't have deposits of other minerals inside them - geodes are when other minerals seep into the hollows in rocks.
3) Drill a hole in a stone, put some abrasive material (e.g. sand) in it and grind a hollow out with a stick. Immensely labour intensive, but many things were in the stone age. People had plenty of spare time.
If you're wondering about size after seeing some geodes for sale online, that's not the limit. They can be meters across. The size limit for online sales is practicality, not existence.
The point I was making about the stars alignment was asking why was it so important back then, when these days nobody bothers with it. Why was star alignment so prominent in their building? What was the point?
Ritual/superstition/religion, whatever you want to call it. And many people do bother with it today - there are plenty of people who believe in astrology.
Also when we talk about religion, while I can understand the 'leader principle' that the masses have a group urge to follow a leader, it doesnt account for the looking up at the sky part that we seem to brush off as mystical. Why were they looking at the sky in the first place?
Because it's there and humans are curious. You'd see stars without looking up, so you'd look up to see more. Or you'd just look up anyway just to see what's there. Humans are also heavily wired to see patterns and seek answers, which combine to perceive meanings in patterns. We do it so well that we frequently perceive patterns that aren't really there and meanings that don't exist in the patterns even if the patterns are really there. Also, in most religions the gods were elsewhere, some special godly realm. They might visit the mortal realm, but they didn't live there permanently. Since the gods were above humans, it sort of made sense that their realm was literally above ours. The gods were usually in the great unknowns. Even if they did live in the mortal world, it was in the great unknowns of that world. Sea gods, for example. The depths of the oceans were absolutely unknown to the ancients. They're very sparsely known even today, but back then they were totally unknown and unknowable. Add in the powerful urge to have answers, to know or at least think you know or at least try to devise an explanation that might be knowledge, to strive for knowledge, and people are definitely going to do it. They could see the sun moving across the sky. They could observe that it was vastly powerful, the bringer of life and death, the source of light and heat, burning in the sky every day thoughout time. Something so powerful must be explained, its nature and its movement, and the answer must be far beyond humans - it must be supernatural. A god? A thing made by a god? A thing even older than the gods? Whatever moves it across the sky must also be supernatural, obviously.
People looked at stars and perceived people and animals into them.
That's how strong the human urge to see patterns is. The "constellations" are nonsense. The chosen stars don't look anything like a hunter, a bear, a swan or whatever.
If a weather balloon flew past you in the sky you would know it wasn't a natural weather season, even if you'd never seen a weather balloon before.
True, but I'm not seeing the relevance. Some people would "see" a supernatural explanation. Some people would "see" an alien explanation. Some people would "see" that they didn't know what it was and were willing to admit that. But what does it have to do with ancients people (or modern people, come to that) looking at the stars and "seeing" patterns and meanings?
It's a sad fact that even today if I saw something unusual and told someone else if they demanded proof and I hadn't taken a photo or video they wouldn't believe me. But that doesn't mean that it didn't happen.
I don't think that fact's sad at all. I think it's a good thing. Why should people believe a random stranger making unsupported claims? I'd pencil in an assumption that they had seen something, but without any evidence it would only be an assumption and it would say nothing about what that thing was or even if it actually existed. Humans are prone to optical illusions and not infrequently to seeing things that aren't there (especially when tired or when falling asleep or when waking).
