I have been down there for just that a long time go working with a delivery company. It is cool down there. You avoid most of the heavy traffic congestion on the main street. It is like another world.
Here are some pictures
a view from the river
you can see that what looks like windows shows the lower level of the street.
there are a few small areas that have a third level.
a long time ago
for more information click on the title. In the article you will see highlighted Wacker Drive.