Google Earth is a free app that shows you the earth in 3-D. Veloroutes.org can output any route in KML format, the format that Google Earth understands and displays.
You can also view recently saved routes (up to the last 1000) all at once! Here is what this looks like for San Francisco:
click here to download the recent routes KML file.
click this link to install the Google Earth, along with other PC tools: