Being the first in what I hope will become a series, I'm still experimenting with side-view symbology. For the spiral stairs, I took my cue from Dyson's tutorial (alas, I didn't have time to attempt the hatching). I decided to stick with the regular representation for doors and secret doors and also added hanging lamps, a ladder, a sarcophagus, a fountain, and a couple of traps. The idea behind the trap in the chamber in the upper portion of the tile is that when triggered it will flood the room with the water (or other liquid) from the reservoir above.
This post is also associated with the RPG Blog Carnival hosted by Dyson Logos.