Despite being launched 22 years ago, the original Doom still has a large fanbase. Doom co-creator John Romero went on a trip down memory lane last week and created his first Doom level since 1995. You can find the new level over here, you don't need the original version of Doom to play out, the shareware version suffices.
And here's a YouTube clip or two showing off Romero's level design:
By the way, the official Doom reboot is expected to hit the PC, PS4 and Xbox One later this year.