I feel kind of ashamed of this map compared to others posted in this forum, with their high color and shading. You guys have been going forward, but I've been looking backwards. If you're old enough to remember maps inside modules that looked like this one, you're Old Enough. :)
This is the Blackwind Stronghold, an ancient, abandoned guild fortress below the city of Anchorest. It was designed as a 0-Level dungeon.