The architect in the intro is the one I created for the example in the last post, and the theme ties in to the fractal gaming idea. The site is also a path between worlds so I'll add it to the list for the Ends. It doesn't need a map and is more or less system-neutral.
The First and Last Die
My memories began the day the adventurers first found me, the day I sensed that unearthly movement, as of great rocks crashing together. They knew of my ability, my work to date, and as they asked questions the knowledge flooded in. I draughted for them, oversaw the creation of the stronghold, and my past life grew. A pity they found out about the masterplan... Still. I took up with them for some time, triggering traps, searching out secret doors, building mausoleums. I studied the works of the ancient architects from within. Then the last adventurers died, a total party kill, and life began to grow faint. I'd lived through them, for their otherworldy needs. Compelled from beyond.
Time at last for my one great work.