Alright, so the setting of this dream combined with teleportation, and the fact that there were a few other people wandering about lead me to believe I may have reached some sort of dream world equivalent of an airport or a truck stop or something.

I was in a relatively normal dream that wasn't really that interesting, I can't even remember what it was about, when I decided within the dream "This is boring. Let's go find something else." At that moment, I was wisked away to this room built of yellowish bricks, like the kind that pyramids are made of. The room had one wall missing, however. In place of a wall there were 20 gray columns, each with a different colored glowing gem at the top. Past the columns was the rest of the universe, pitch black except for stars and galaxies. In the center of the room was a planet, just kinda floating there. It looked like a combination of earth and jupiter, with a single ring around it. The planet glowed and the colors on it swirled around a little. I then noticed that there were a few other people in this room, just kinda wandering around and looking at the planet and the columns. I went over to the columns and noticed the one at the end with a greyish flickering gem was broken off and lying on the floor. I knelt down by it and touched it, then was teleported to the surface of another planet that kinda looked like Mars, but completely gray. From here I could see every other planet out there, not as though they were in any kind of solar systems, but as though they were freely moving throughout space.