Carve a sphere

I'm making a map that requires a large sphere. Specifcially a remake of the CS:S map Starwars2. I don't know much about displacement, but I was wondering how I'd go about making a sphere in Hammer, which I could carve. When I try to carve a regular subdivided cube, it goes crazy. If this isn't possible, can anyone suggest something else?

Thanks.

make it out of brushes that are trianglular shaped. like a dome.

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http://img362.imageshack.us/img362/8521/windows981dk.jpg

Nickelplate is my dad

Don't carve.

And if you just want a sphere, use the sphere tool.

If you want it hollow ... follow this tutorial:

http://www.snarkpit.net/editing.php?page=tutorials&game=HL&id=27

Or this one:

http://www.snarkpit.net/editing.php?page=tutorials&game=HL2&id=182

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Blame it on Microsoft, God does.