http://www.autodesk.com/products/autodesk-autocad/free-trial
http://www.autodesk.com/products/autodesk-autocad/features/all/gallery-view
http://www.autodesk.com/products/autodesk-autocad/features/all/gallery-view
Take a tour of the user interface in AutoCAD 2015. Learn how to view objects and drawings from multiple viewpoints and navigate through designs with the expanded features on the navigation bar. Also learn how to switch between model space and paper space and get more details behind the features available on the AutoCAD ribbon.
Source: Autodesk