I need to build a site with features of a site like http://gethiroshima.com where there are four or five general categories (Places, Events, etc.) and by clicking on those you will be taken to sub category pages with several other pages. Ex. Places leads to a page with Restaurants, Nightlife, Cafes, Shopping, etc. By clicking on Restaurants it leads to a page with teasers for all restaurants listed and the left menu has classifications of types of restaurants to filter the teasers. By clicking on one of the restaurant teasers you will be led to a restaurant profile page like the one I have built at http://chibabeat.com/bldynew.html.

For each restaurant profile I need to have a comments and reviews option for users where reviews for restaurants are displayed below the restaurant profile and I need to have a block on every page that displays the latest reviews. Now I notice that all of their restaurants are in alphabetical order but I cannot find php anywhere in their code. I have no idea how they manage so many places. Are they using a content management system?

They also have forms to submit restaurants and other places like the one at http://www.gethiroshima.com/en/Places/SubmitPlace. Are they manually doing this in html too.

They also have an event calendar that is always up to date and a classifieds ads section that displays the most recently added ads on their homepage.

Basically I need a site with most or all of the features of http://gethiroshima.com but I have no idea how they do a lot of their stuff. On the outside it looks like it is all run off of html but I think there is more to it than that. It just seems like entirely too much content to manage on pure html. Can anyone look at their site and tell me how they are doing a lot of their features?

They are certainly using some kind of content management system.
You can't see PHP anywhere in the site's source code because you never see PHP in source code, unless the server is configurated incorrectly. PHP is parsed on the server's side and the output is always just HTML.
Also, it seems there are no .php (or any other) extensions in their website because they make use of Apache's URL Rewriting capabilities (or an equivalent).

I really wish I knew which CMS they were using so I could organize my site like theirs. I'm messing around with Drupal right now but the learning curve is pretty steep and most drupal run sites all look the same. This site definitely doesn't look drupal run.

I think they are using mambo.
The login box and feedback form is same.

grrr. I'm pretty sure that mambo has a lot of issues. I have heard a lot of bad things (opensourcecms.com) and correct me if I'm wrong but you have to pay for the extension to get friendly urls. Right now I'm messing around with Drupal to see if I can get similar hierarchy and function.