Do a “site:yourdomain.com” search on Google.com, like this.
In terms of on-site SEO, Title Tags are still numero uno when it comes to influencing rankings. I just did this for Tidings.com last month. Even for an SEO veteran like me, it is always amazing how many pages aren’t targeting a keyword/keyphrase I care about, and at least in my case, I was shocked at the number of tag and category pages Google had indexed that weren’t targeting a keyword at all.
Even SEO novices can perform this search and highlight pages for their marketing staff or web developer to improve.
(As an aside, it is the best way I know to audit your SEO agency, since Title Tags are the first thing any reputable practitioner will look at, and fix if necessary.)