Your little Suburbia is in Ruins by August Burns Red, or maybe casting such a Thin Shadow by Underoath. (Your little Suburbia for its actually intensity, and Casting Such a Thin shadow because its the type of song that sends chills down your spine from the way its constructed, emotionally, vocally, instrumentally)

Not the most intense ever-but one of the most interesting..
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''lost to apathy'' by dark tranquillity

AEnema - Tool

Arms of Sorror by Killswitch Engage

gets me everytime

/sobs

I think the hook riff to Elegy by Becoming the Archetype is possibly the most intense piece of modern music.

All time favorite has to go to Black Sabbath by Black Sabbath.
That song is still as heavy, intense, and just plain scary today as it was 40 years ago.

A silver Mt.Zion's-Sisters! Brothers!Small Boats of Fire........
Kinski's Child had to catch a train

Paradise city-Led Zeppelin :4'40" to the end! It was really intense for me!
Cheers!

am i evil- metallica it like grows into this crazy bamo i wanna punch something music