Is there a way to figure out where apache rewrites are going...???

I've got a new client that has a pretty basic web site at first glance.  They gave me their FTP info and I'm trying to download their site so I can develop on my test server.  It's not like anything I've ever seen before, though.

It's a linux server but the /www directory has just a few images in it.  nothing more.  There is crap scattered all over this server in the directories above that.  Mostly .png images.  I can't find any index.php pages at all.  

The whole site when you browse it just uses directories on the end

domain.com/page1
domain.com/anotherpage
domain.com/etc

Those directories don't exist, though, when I'm looking in there via FTP.  So I'm guessing there's some apache rewriting taking place..??  

How can I figure out where these pages are actually located so I can work with them?  Any information would be greatly appreciated.  Thanks!