Asset History report shows you metadata types and the created and last modified dates of those types. You can get to the report by right-clicking on the Snapshot icon, and hover over the Document option. When you open the report, you can choose any of the Metadata Types available in the snapshot to view as a preview in the right window.
If you'd like to export this view, you can right-click on the table at right.
If you'd like to select multiple Metadata Types to view in one report, click the checkbox next to each type in the lefthand column. Once you have all the types selected click the Display Report tab at the top. This will break each type into its own table.
When you export the Display Report into an excel or CSV, each type will be broken out into its on tab.