Google Treasure Hunt - Map Layer

Even for an April Fool's joke, this is a pretty neat map layer feature. Google Maps already allows you to view terrestrial maps at street level, terrain based, or from above via satellite imagery. This map view reminds me of ye olde mappes that one would find in a pirate or seafaring game. The below image is a screenshot of the greater Seattle area. Nicely done Google.
An April Fools treasure map display from Google,
the marked spot on this map is a trailhead at Cougar Mountain
near Issaquah, WA
Google's promo video for this feature is very amusing: