The first and last of these dreams don't appear to give much insight into your psyche. They seem to be simple "mash up" type of dreams. Images of travelling along roads, remotely controlled cars, music, buildings, flying, all jumbled up into the psychedelic mess of the dreams that we are all so familiar with. You have dreams like this pretty much every night but forget all about them because you don't wake up at the right time.
The other dreams are more interesting.
This is the point when you would tell me about your second dream ("Another time I was in what I call The City.") and I would ask "How did you feel?"
You would then tell me the emotional context. "I felt scared", or "I felt lost", or "I felt strangely calm" or ...
I would then take that reply as my signpost and reflect the emotion back to you. "Did you feel lost because you didn't know where you were, or because you didn't know where you were going. You didn't know what was on the other side?" (for example).
Without that context, as with some of the other dreams, all I can do is look at the words that you use and take (hopefully) good guesses.
With your second dream, I think the progression goes something like this.
However you imagine The City, at the time of this dream it is very nebulous as a concept. You don't actually know what it looks like on the other side. (detail which is added in later dreams?). In your dream, you want to cross the river, but because you can't imagine exactly what it looks like, you can't cross.* There is no imagined geography to walk into so your mind finds a way out. In this case, you just turn around and walk back to the part of The City that you have created in your mind.
As for the stones turning into possessions? Well, it does seem to be a rather literal interpretation of the phrase "You can't take it with you when you go". Does that phrase have a great meaning to you? Does it sum up how you feel after buying stuff, then looking at all of the stuff you have and feeling that non of it gives your life any meaning? (Note: this is just a different way of asking "How did you feel").
Alternatively, it could just be one of those transitions that happen in dreams. You look at the rocks and your mind wants a bit more meaning so suddenly, they're "things". The fact that they are things that could not be taken across by anyone does seem significant.
I won't go into any detail about the other dreams (look at how much I have written about just one of them!). Looking at the dreams as a whole, I get a sense of disquiet about your existence. "What's it all about", "why are we here", possibly that feeling of "Cosmic loneliness".And yes, once again I am asking "How did you feel". All very human and normal by the way. I don't have any objective evidence for this, but from the conversations I have had, a reasonable percentage of people have these kinds of feelings at some point. For some of us, it never really goes away.
Feel free to tell me that I am writing b@~~£&!t. Without being there, this is a one sided, imagined conversation, which may be very very wrong.
* Not being able to dream things you have not seen or experienced is an old observation. The Marquis d'Hervey tried to jump of a tall building in one of his lucid dreams. Everything was fine until he got to the point of impact when "within a minute, he was back on the ground, unscathed". Having never experienced falling and hitting the ground in such a way, it was impossible for him to dream of the moment of impact. He just fell, then was suddenly on the ground, but no impact.
I hear what you're saying. All valid observations and postulations. I do analyze those which seem more meaningful. I could go on about it, I guess, but I really don't have the energy right now and I don't want to risk a thread hijack. I get what you're saying, though. All very interesting stuff.