55154635_ual_Globe____ArcGIS_Comparison__ArcGIS_KML_Layer_Functionality
[KML Feature] Folders
KML folders are used to organize placemarks, geometry, screen overlays, and other folders. You can tour placemarks in a folder by flying to each in turn. ArcGIS fully supports folders.
USGS InfoBank Virtual Globe -- ArcGIS Comparison
ArcGIS KML Layer Functionality