The CartoDB folks recently published a tutorial on how to use the NYPL’s MapWarper maps inside CartoDB.
You can of course use http://mapwarper.net if you want to upload your own images.
These maps. made by Andrew Hill look lovely, and it’s very easy to use – using the tile XYZ template:
http://maps.nypl.org/warper/maps/tile/27562/{z}/{x}/{y}.png
and
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