Google Streetview still amazes me everytime I sit down to play with it. Geoguessr takes playing to a new level by making it a game to guess at which random location you’re being dropped. Drop the marker on the spot you think is closest. The closer you guess, the higher the score. Easy but very addictive if you’re into this type of games. And it has some educational value, too. Check it out here.
Speaking of Streetview, if you’ve been following the news around the Oculus Rift VR headset, you’ll have seen Oculus Google Street View, otherwise take a look for sure. (Github repo). For actual headtracking support using the Rift, you need a websocket server.