location public_html in ubuntu server

I just installed Ubuntu server on a machine at work.
It's a stand alone webserver.

I'm running webmin, apache, mysql, & proftopd....

I'm a rookie with linux - this is my first server ... although, i'm done development for years & am very familiar with networking, web hosting, etc..

Where can i locate the public_html folder?

I get the "It Works" page when I access the server by IP from another machine in the network.
I can't resolve the linux box by name bc it's not joined to the local domain.