This is the carpark-in-the-cave/hill. First picture shows the ancient (well, 1700s/1800s?) tunnel through the hill. It's called the "neutor" in the next picture. On both sides of this tunnel you can get pedestrian access (3rd picture - you can smell the moisture in the cave) to the car parks (4th picture - ground floor, 5th picture - top floor = 3rd floor).

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This is the church which appeared to have a really small accessible area even though the building is very big. Turns out it's attached to a hospital (see the plan of building - only the ovalish and semi-circular parts are the church), and you can access the church from the hospital (door with "Kirche" label on top).

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Back to the hill - in the purple building with a red banner, there are lifts (2nd picture) which leads up through the hill to the modern art museum on top (3rd picture).