The Black Parade: Level 04: Death's Dominion
So. Looking Glass's seminal 1998 PC game Thief: The Dark Project spawned an active and long-lived modding community, who created hundreds of fan-made extra levels, many of which are extremely artful and creative.
One group of particularly obsessed loons spent seven years crafting an extraordinary set of such levels, forming an entirely new single-player campaign for the game, named The Black Parade. This was released last year and I only just became aware of it. I'm four missions in, absolutely loving it, and completely lost in the catacombs beneath the pseudo-medieval city.
Hence, my lovingly hand-drawn map of mission 4, Death's Dominion:
spoilers