Color code for this map is that green pins are sites that currently have website posts dedicated to them (with link provided), while blue do not.
The classifications for museums are a little arbitrary and personal opinion based, other than the national museums (blue) and on-site museums (purple). As far as what differentiates a major (green), mid-range (red), and minor (yellow) museum largely comes down to the size of the collection and time I needed to see it. Generally speaking, I used the guidelines of roughly under an hour for minor, between one and two hours for mid-range, and over two hours for major. It mainly just serves as a means of breaking the museums up into groupings, rather than any real qualitative analysis of the museum. As with sites, museums featured in completed posts will have a link.