All roads lead everywhere. The longest journey starts with a single step. And so on and so forth.
Pick a continent. Then click anywhere on it to start drawing all the roads to that place. Reload this page to start again.
Google limits the number of queries so roads will stop drawing after a while...
(Tip: Zoom in before clicking to avoid empty areas!)
("Everywhere" in this case means places with over 5000 inhabitants, courtesy of Geonames)
A thing by James Bridle