Google has just announced that Google Earth Pro, formerly $399.00 per license, is now free. Google Earth allows users to "View satellite imagery, maps, terrain, 3D buildings, galaxies far in space, and the deepest depths of the ocean." The Pro version takes these capabilities up a big notch.
Google Earth Pro includes the same easy-to-use features and imagery as the free version of Google Earth, but with additional professional tools designed specifically for business users. [And I suspect for some photographers]
Getting Google Earth Pro for Free, Step-by-Step: