Perspective View

The Perspective view can be accessed by clicking the Perspective tab, which is located to the bottom-left of the viewport (see above image). Unlike the Top-Down view, the Perspective view is entirely 3D, and allows you to view any portion of your landscape design from any angle. Some objects are best edited in the Perspective view, such as house doors and windows, because in the Perspective view you are able to view the objects at eye level. The Perspective view is also especially useful for raising or lowering objects, modifying the terrain and grading, or changing the materials of an object.

See also:

Top-Down View
Realtime Walkthrough
Panning the View
Orbiting the View
Zooming the View
Zooming into the Selection
Picture Import Wizard