Hey guys,

I'm getting into some dark classical music. Please recommend some good heavy symphonic classical music.

Toccata and Fugue in D Minor BWV 565. The original.
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i like Requiem for a Dream by Clint Mansell.

also theres O Frotuna from the Richard's ale commercial.
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I'd say 20th century Russian composers are a good start. Shostakovich for sure. Check out the typical classical pieces like Stravinsky's Rite of Spring, Belioz's Symphony Fantastique, etc. I personally really like John Adam's Fearful Symmetries if you don't mind some minimalism.
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"It is the spectator, and not life, that art really mirrors." - Oscar Wilde

Dark, heavy, symphonic music........Sounds like Late Romantic era.
Gustav Mahler is my man, also Anton Bruckner, Verdi, and of course Wagner.
The Russians are always a good choice, too.
The first classical piece I really got into was fantasia in D minor. I'm not sure I know too much "dark" classical music, try Dies Irae by Mozart. Choir and symphony. Sounds very awesome.