While you are inside the Virtual Tour, click on the circles on the floor to walk around. 

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The Dollhouse View allows you to see the entire house in 3D. It will allow you to move the entire house around, zoom in and out, as well as click on any room from the outside and it will take you directly inside to walk around and look around as if you were actually there.

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The Floor Plan View allows you to see the house in a floor plan view.