The command site: can be used at nearly any search engine – and certainly Google, Bing, Duckduckgo, and Blekko – to search all the pages the search engine has indexed from that domain: eg., site:utoronto.ca marshall mcluhan looks for marshall on all pages in the University of Toronto domain. This is one of the best advanced search methods to know.
Daniel Russell give us another application – use site:maps.google.com to find maps and commentaries other people have posted about places. Brilliant. Watch his 1 Minute Morceau video to see what this is all about.
My example is a web search for site:maps.google.com manitoulin trails.
You will likely see some kml files – kml is a file format used to display geographic data in Google Earth and Google Maps. You must view it in Google maps – and Google gives you a handy link to do so.
You might also find custom Google maps that people have created about an area with comments and photos.
Either way you could find some real treasures that would not normally appear in Google web search results.