Had this last night, wrote it down on paper but didn't get a chance to post until now. Also wall of text warning.
I dreamed I was walking along a narrow road along the edge of a mountain. On my right was solid rock, and to the left only the small metal barrier separated me from a plunging cliff face. It was raining hard, and I couldn't see anything past the barrier, or more than a few meters in front or behind me. I don't know where I was going, or why, but no matter how miserable I was I knew I had to make time or I would almost certainly die. My dream-brain seems extremely drawn to the idea of a miserable journey.
So I plodded along, gradually becoming more and more soaked, when the road suddenly ended. A flimsy wooden barrier with blinking lights on it sat right in front of a solid drop. I needed to keep going forward. I vaulted the barrier. I couldn't see anything through the rain, but the fall was very short, and when I landed the fog disappeared completely. I found myself in a lightly forested basin, surrounded on all sides by mountains, with a dome made out of a solid piece of weather-worn gray stone in the middle. There were little niches cut into the sides of it, big enough to let light in, and an opening big enough to walk into directly in front of me. Something about the thing made me feel uneasy, but I still went inside. The inside was dominated by a gigantic hole leading straight down, with only just enough space for two people to walk past each other around the edges. On the far side of the dome, a staircase cut into the side of the hole led down into the darkness.
I stepped onto the staircase, and not a moment later, I noticed that there was some source of light down at the bottom, several hundred meters down. I couldn't tell what was down there, but the light filtering up was just bright enough to illuminate the stairs where the natural light from above didn't. At the same time, I noticed another figure standing in the doorway I had entered from, the light too faint to make out its features. It just stood there, but the sight of the thing terrified me. I ran down the stairs as fast as I dared. I looked over my shoulder occasionally, and saw the thing back there. First it was at the top of the stairs looking down, then across the pit looking over, each time just a little bit closer. I was nearing the bottom, and the light from below was getting easier to make out. The stone floor had a huge brazier lit in the center, which for whatever reason didn't produce any smoke. The stairs didn't lead all the way down, instead terminating in a ring mirroring the one above, in the ceiling of the room below. The figure was just behind me now, and with only a moment of hesitation I jumped down from the shelf. Checking back up, I saw the thing was gone.
I wasn't happy for long though. Looking around the chamber, the first thing I noticed was that there was no way out. Every square inch of the wall, ceiling, and floors were extremely intricately carved, with unusual angular shapes that didn't seem to depict anything in particular. The room was decagonal, with a different pattern on each face of the wall, with corresponding sections marked out in the floor and ceiling. A little circle was set into the floor near the fire, which had since receded into the floor to give an unobstructed view. When I stood on it, the carvings on the wall and floor seemingly came to life. The sort of jumbled looking patterns neatly arranging themselves to show a panoramic view, which changed depending on which direction I was facing. Absolutely beautiful scenes of nature, heaven, hell, mundane life, and all manner of other things I couldn't easily identify appeared with a slight shuffle of my feet or a tilt of my head. As I looked I noticed the room had started to gradually darken, and I suddenly became aware of how hungry I was. The last carving showed my room, with a figure standing in the corner, too dark to make out any details. The figure disappeared when I blinked, and I found that I had woken up.