There are many hiking trail layers available to Google Earth. Last year Google added a hiking layer directly to the featured layers of Google Earth but has recently moved it to its Google Gallery as an external user layer.
To find others just search for hiking trails and google earth using your favorite search engine. One such web site is Backcountry Secrets, which has many Backcountry hot spots including biking and hiking trails across the US and few other countries.
Links are available in related link section.
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A handful of web sites have cool things and special topics of things you can find in Google Earth. Google Earth Hacks is one such web site and can find crop circles with screen shots of the location and a link to jump to it in Google Earth or Google Maps. The Google Earth blog also has a couple of articles on crop circles in Google Earth along with screenshots and related links. Click on URLs in related links below for more details.
Can't find myths or legends on Google Earth -- only actual sites. If, however, Atlantis was ever found then you could just enter the latitude and longitude of its location to jump there in Google Earth.
Check out the related link below to find help using the Ruler Tool in Google Earth.
There are many different logos for Earth Day. You can do a Google image search for them.
Normally Google Earth Pro auto-updates to the new version when it is available but if that feature is disabled or not working you can manually install the latest version. Visit the Google Earth download page to download the latest version for Windows, Mac, or Linux desktop platforms. You can show the version of Google Earth in the Hep menu and selecting "About Google Earth". Note that Google Earth desktop has been replaced with Google Earth Pro so all updates will be with the latter.For the web version of Google Earth, your web browser always accesses the latest version and you never have to install or uninstall the application.Mobile platforms can update Google Earth using the Google Store, Apple store, or equivalent application management utlility on the particular platform.