Seeing places when my mind is relaxed/dreams about detailed places

This is really weird, I'm not sure if it means anything, but I'd be interested to hear if anyone else has experienced this.
When my mind is relaxed, usually just before sleep, I sometimes get a flash of an image of some place I've been. And it's so incredibly vivid, it's like I'm standing there again. It could be anything. A house I once lived in, a house a friend lived in, a house I visited once years and years ago, a store in my hometown, once even an air and space museum I'd forgotten I'd even visited.
And when I think of it, I do have a very good memory of places. I've never considered whether this was normal, but if I try to conjure a place I saw only once, years ago, I can see at least the bare floor plan. I remember where doors were, and tables, where the kitchen and bathrooms were. I'll remember the house better than the person who lived there!
Is that weird?

I get the feeling it's somehow related to dreams I have sometimes, though I couldn't tell you how. Almost all of my dreams feature very detailed environments. Sometimes I have the "fog" type dream where all you remember is what someone said, or people rather than places. But overwhelmingly, my dreams take place inside buildings. Most commonly, a fictional house or a real store.
The dreams about houses are really bizarre. They always follow the same pattern: I'm in a stranger's house, they don't know I'm there, and I'm trying to get out without being found. Even weirder, I almost always know the reason I'm there, and it makes no sense. I'm trying to get somewhere else. Like it's a shortcut, except it's the only way I can go. I don't ever know where I'm trying to go, just that I need to go through this house to get there. I'm always terrified someone will find me and I won't know how to explain why I'm there. I think I was discovered once, and immediately ran away before the dream person could react to me.
The dreams about stores I don't have often anymore, but when I do, I just remember being in the store, how it looked. Maybe what I wanted to buy. But no more than that. It used to be different though. I would dream I was going to get in trouble. Like one time in my dream my friend and I were at the store and I realized she didn't have shoes on, and just as I begin to panic about that, sure enough an employee comes up and tells her she can't shop without shoes, and she, for reasons I can't fathom in her character or my dream, ran away from him, and then, almost comically, he radios for help and she has a whole merchandising team going after her.
I've also dreamed about the same fictional (I think) college twice. I remember it because the architecture was appealing to me. I remember the lobby, the main building, whatever. You walk in the front doors and there's a polished wooden help desk, like the circulation desk at a big, old library. The floor is some kind of tile, marble I think. The ceiling is high and made of triangles of glass. But the best part, beyond the big desk are two curved wooden staircases, made of the same wood, leading up to a large oval balcony overshadowing the rest of the first floor, and on that balcony is the library. I remember the first time I dreamed it, I had just started attending the college, and I was in transports of delight at the sight of the library. I already knew I'd be spending more time there than in my dorm.
Oddly, I never went away to college, I've only done community college.

The only other recurring dreams I've had stopped a few years ago. I used to get them frequently, then just a couple times a year, now not at all. But I dreamt that I was either failing art class, or couldn't find the classroom on my first day. Always art class. Which I sometimes did get low grades in just because I wouldn't turn in something I didn't like. I've thought that dream must represent my frustrated artistic ambitions. But it's pretty much stopped now.

Thoughts?

Some times our dreams mirror how we are feeling about real life situations we are experienceing. Situations you are trying to figure out, and how you got into them, in the first place. You are gifted with a good memory. Your memory is much better than average.

Of some types, I guess. I can remember places and voices and things I've read, but I can't remember things I'm supposed to do, things I should consider before acting.

Cool. You said- "when my mind is relaxed"- do you meditate?

Not really. It's actually pretty rare for my mind to be blank before I go to sleep, but when it is, this happens.
Maybe my brain doesn't like being silent and that's its attempt to stay awake?