Google has released an 8-bit Famicom/NES version of Google Maps. You can access it here.

Here's a zoom up of Shibuya Station.

As you might have guessed from the copyright, this is an officially sanctioned Square Enix item. The Dragonlord linked to the map at the Dragon Quest official site, where he also announced that he'd completed his takeover of the world (Oh no!).

Google also plans on releasing an actual NES version of the mapping program. Here's a video of Tatsuno Nomura explaining how the technology works: