The Treasure Map layer for Google Maps is all well and good. It can't really compete with the 8-bit Maps we saw last year, but it's pretty cool, and beyond the new skin for Google Maps, there is a Treasure Hunting game. Google did a good job, even going so far as to add a sepia filter to all of the Street View images in Maps.
The story is that while Google was building up its ocean maps, they came across Captain Kidd’s 315 year-old map showing the location of treasure around the world. If you want to check it out, just head over to Google Maps. And, keep an eye on the Google Maps G+ page for more clues.
source: Google Maps Blog