Looks like Nintendo is putting out an older piece of software onto the eShop, one that I didn't even know existed, titled Nintendo 3DS Guide: Louvre.
The video does a pretty good job of showing it off, but if you don't have the time to watch it, it's an interactive audio guide of the Louvre museum in France, home of many famous paintings and sculptures. What prevents this guide from being contextually useless (as most audio guides would if used externally) is that it contains high resolution imagery and 3D models of practically every piece of art in the museum in addition to voice narration about each piece, both as a virtual tour and as a directory. If used inside the Louvre itself, it will narrate as you navigate through the museum. (3DS XL systems with the software are available for rental at the Louvre as well.)
It's rather steep at $19.99, but considering the encyclopedic content of this, I'm willing to bet some art buffs would find it well worth the price.
Also, physical copies are available as souvenirs only at the Louvre. I have a feeling this product might become quite rare in the future.