Don't know if this has been covered in another thread. If so, sorry.
Tesla has opened the supercharger tap and new sites are pouring out...
“We started 2017 with over 5,000 Superchargers globally and by the end of this year, Tesla will double that number to total more than 10,000 Superchargers and 15,000 Destination Charging connectors around the world. In North America, we’ll increase the number of Superchargers by 150 percent, and in California alone we’ll add more than 1,000 Superchargers. We’re moving full speed on site selection and many sites will soon enter construction to open in advance of the summer travel season.
Tesla has a new supercharge web site.
https://supercharge.info/If you go to the map page and click on "Map Options" one option is the Way Back. Let that ap run (you might want to speed it up a bit) and you'll see how the Supercharger system grew over time.
Zoom out enough to see the US, Europe, and Asia all at the same time.
The Model S started selling in December of 2012 and about a year later an owner could drive up and down both coasts and from coast to coast on a single route using Superchargers as they traveled.
There's a lot of interesting data on the site. All the locations and the number of charge points at each. Some sites now have 20 charge bays.
Tesla will build larger sites along our busiest travel routes that will accommodate several dozen Teslas Supercharging simultaneously.