Geoguessr is a game. It drops you at a random spot on the planet Earth along a roadway (using Google Street View). You have a certain amount of time to make your best guess about where you are, based on whatever clues you can gather around you in "Street View" mode. You can move along the roads a little, looking at signs, scenery, buildings, plant types, whatever. The closer your guess is to the actual location you were "dropped", the more points you get.
Here is the result of my first attempt: