A few years ago I went to see Tour13 in Paris, which was the most awesome / insane art exhibition I have ever seen.
It was organized by Galerie Itinerrance and was basically housed in a high-rise that was about to be demolished. The Gallery got a hold of the building and invited 80 street artists from around the world to each paint one of the apartments. The results were incredible, with so many different styles and techniques in such close proximity. Since the whole experience was so completely immersive it was difficult to capture through pictures. But for a glimpse of it, see for yourself:
The outside of the building

One apartment (I cannot remember the artist though)

The corner / walls of another apartment (also cannot remember the artist)

I assume this was a Japanese / Asian artist

Spooky bathrooom

Is this Pantonio from Portugal?

French artist C215 also left his mark

Agostino Iacurci :)

Wicked

Looks like Picasso

Not sure who this is

For a whole complete view of the project, visit http://www.tourparis13.fr/
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