You can have a look at a navigable multi-wavelength image of the Milky Way at the Astronomical Data Center. It's not really '3-D' but at the NASA Goddard Space Flight Center, they have been working on a fly-through annimation in 3D that is interesting. Thus far there really arent any accurate 3-D models that you can navigate, because our data for what lies beyond a few thousand light years is so sketchy and incomplete. Out to 100 light years, we know where all the stars are located with fair accuracy. Beyond 1000 light years, we know where a few thousand nebula, star clusters and other major objects are located. By the time you reach 10,000 light years we are down to a few hundred objects whose distance are accurately known, but the total number of other objects is probably in the 100s of thousands or millions, and there are over 500 billion other stars too. So that's why a detailed 3-D model would be very hard to create with any realism.

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