One of my favorite places to go relax and read was the Main Train Station, or Hauptbahnhof, in Frankfurt.

The trains run on electricity, which doesn't seem to pollute the air.

The roof contains transparent materials to allow natural light into the station.

There are plenty of kiosks for coffee and food, too.

In the video, I'm coming up from the subway, into the main building. Notice the large, airy expanse. It was very cool to be inside a gigantic, larger-than-life, man-made structure in which many people from around the region and world congregate. I enjoyed the positive energy inside there; good for reading and relaxing.