multiple Wikis

I want to essentially have 2 separate wikis on one site (2 very different topics that the viewer can choose to view). Trying to figure out the best way to set this up. Wiki categories widget doesn't seem to have the functionality to do this well.
I'd like to separate the 2 - click on Wiki1 or Wiki2 and that takes you the the page where all those particular wikis/subwikis are listed. Help please.