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On the upper left corner of the tour image, you will see a button with a square in it. Click this button to view the tour in full-screen mode. Press the ESC button to exit full-screen mode. Click and hold your mouse button, and drag the image in any direction to look around. In various places you will see a small white circle with a black arrow inside it. This indicates a link to another part of the tour. Click on it move to that part. The scroll wheel on your mouse will zoom in and out.
Explore the images thoroughly. There's lots to see.