Few franchises have a past as storied as Doom. The debut game in the series was released way back in December of 1993 and to celebrate the 21st anniversary, id Software co-founder and gaming maven John Romero unleashed a barrage of never-before-seen artwork and photos from the game’s development on Twitter.

Much of what Romero has posted is textures and such from the game, both those that made the cut and some that didn’t. We’re also treated to some original Doom title logo tests and sketchbook scans that were eventually turned into textures.

It’s remarkable that so much of this stuff still exists considering how long ago 1993 was in computer years. For reference, my oldest photos only date back to 2001 or so (backups are key).

Perhaps the coolest pieces of all are the shots of the original clay models of DoomGuy, the Baron of Hell, the Cyberdemon, Spiderdemon Mastermind and Mancubus.

id Software is hard at work on a reboot of the original 1993 Doom. A sneak peak of the new game was revealed at the annual QuakeCon gaming convention this past July. We’re told the game is being built using the id Tech 6 gaming engine and will run at 1080p at 60 frames per second on the PC, PlayStation 4 and Xbox One.

It’s unclear when the new Doom will be ready but I suspect we’ll hear much more about it as 2015 rolls around.

The entire collection of old Doom art can be downloaded by clicking here.