Here, you'll find the ability to view map overlays from multiple carriers, along with the ability to zoom into a street-level view.

ENGADGET

As the name implies, it overlays photos with a map underneath, giving people a far more visual look at what they were seeing at a given point on Earth (or Mars, assuming Curiosity hasn't reached its data limit this month).

ENGADGET: Instagram 3.0 adds Photo Maps, infinite scrolling and speed improvements (video)