layout sites

Does anyone know of any sites where I can see layouts of rollercoasters?

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"Take me with you. I want to climb the 208' of Superman, hurl through five inversions on Batman, and freefall 20 stories on Scream. I don't throw up....I can entertain in long lines!!"

Probably the best way to find the layout of a number of coasters is to go to mapquest. Find a park on it, them check to see if there is an aerial photo available. The aerial photos provide nice general layouts, though they aren't dimensioned.