Quick. Go to Google Maps and look up an address then click Quest in the top right-hand corner.

Try looking up Googleplex. Or The White House. (you may need to zoom in or out to see things)

An explanation is on the Google Maps Blog

http://google-latlong.blogspot.com/2012/03/begin-your-quest-with-google-maps-8-bit.html

Let me know if you found any other cool things at other addresses.

Update: Danny Goodwin over at Search Engine Watch has screen shots of many of the landmarks found on the 8-bit maps.