Doom - The Unholy Trinity
This is a really fun single level WAD, and is a classic. I replaced the crappy MIDI music with something a bit better.
About this WAD from the wiki:
The Unholy Trinity, or Trinity College, is a single-level PWAD designed by Steve McCrea, Simon Wall, and Elias Papavassilopoulos. As part of their 10 Years of Doom feature, Doomworld named it one of the ten best WADs of 1994.
This map uses a large number of custom textures to create striking "photorealistic" buildings and courtyards, modeled on the real Trinity College in Cambridge, England. It also features an original animation sequence and a replacement music track, which is a partial rendition of "Toccata and Fugue in D Minor" by Johann Sebastian Bach.
Source WAD:
http://doom.wikia.com/wiki/The_Unholy_Trinity
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