Part of the ceiling construction above the main hall. The actual ceiling is located behind the wall on the left. It is hanging lower than it could to make the main hall look less monumental.
The grand finale of the Berlin Trip was the Airport Berlin-Tempelhof. Once the largest building on planet Earth, it is considered to be the mother of all modern airports. It was shut down in 2008 but is now far from abandoned, so the best way to explore it is by paying for a tour.