To go to a 3D view in Revit, simply follow these steps:

1. Open your Revit project and navigate to the desired location in the project where you want to view in 3D.

2. In the bottom left corner of the Revit window, you will find the 'Project Browser' icon. Click on it to open the Project Browser.

3. In the Project Browser, look for the '3D Views' section. Expand the section to see all available 3D views in your project.

4. Select the 3D view that you want to switch to by double-clicking on it. This will take you to the selected 3D view, allowing you to visualize your design in three dimensions.

5. Once you are in the 3D view, you can navigate and manipulate the view using the navigation tools provided in Revit. This includes orbiting, panning, and zooming to get the best perspective of your design.

By following these simple steps, you can easily switch to a 3D view in Revit and gain a better understanding of your architectural designs. This will help you visualize your project in a more realistic and immersive way, allowing for better communication and decision-making in the design process.