While holding the left mouse button and dragging the cursor left or right, you can have a panorama view.
When you guide your mouse cursor over a hotspot, you get some brief informations. Most of the hotspots are linked to the next point of the virtual tour or more information.
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Please follow the labels and signs for orientation.
Class-marks of the textbook collection start with LN.
The context of textbooks is listed in the subject index ("Bestandliste": German, PDF).