Best 20+ minute epic?

My favorite is still "The Divine Wings of Tragedy" with "The Odyssey" a close second.

I have to mention, however, one of the best epics ever, Fate's Warning's "Ivory Gate of Dreams", from NO EXIT. This is an absolute classic from a great prog album! I would have to rate this very close to both TDWOT and the Odyssey.
 
The ODYSSEY!!! :D
I just fell in love w/that song from start to finish!!
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the DWOT in 2nd..