According to this site, Tomb of Horrors is the "undisputed king of D&D modules."
https://nerdist.com/the-top-10-dunge...agons-modules/
I am not sure if that is true, but it is certainly a classic, and there are of it maps available on-line, so I gave a shot at redrawing it.

Actually, I did this as practice last year, but this is the first time I have shown it to anyone.
Click image for larger version. 

Name:	b94.jpg 
Views:	252 
Size:	2.47 MB 
ID:	110084
I am sure I missed a few details, but I had lots of fun making it and just wanted to share it rather than have it sit on my computer and eventually be forgotten.

Here is the map it is based on:
Click image for larger version. 

Name:	b95.jpg 
Views:	153 
Size:	670.9 KB 
ID:	110085