
The Ebon Zikkuract (a very literal tesseract manifestation and now we have the word "zikkuract!")
The Black Ziggurat of Riskail (You know Riskail? That hot, new weird fantasy setting with all the talented writing and artwork...plus their Black Ziggurat has a Shoggoth!)
And what's This? Only the Black Ziggurat of GREYHAWK! (Which also contains an imprisoned Satan-figure and a lightsabre...)
EDIT: I'm hating myself for forgetting The Black Ziggurat of the Mutant Future!