Mapping the Brain: The Human Connectome Project

From the project's website:

Navigate the brain in a way that was never before possible; fly through major brain pathways, compare essential circuits, zoom into a region to explore the cells that comprise it, and the functions that depend on it.

The Human Connectome Project aims to provide an unparalleled compilation of neural data, an interface to graphically navigate this data and the opportunity to achieve never before realized conclusions about the living human brain.

A major challenge, of course, is figure out how to make sense of connectivity data once it's been harvested. Here's a relationship viewer and here's a bunch of images.