The highlight of my day was to walk around the Chilehaus (Chile House) building, inside and out, and admire it.
From Wikipedia: The building was designed by the architect Fritz Höger and built between 1922 and 1924. It was commissioned by the shipping magnate Henry B. Sloman, who made his fortune trading saltpeter from Chile, hence the name Chile House.
It is an exceptional example of the 1920s Brick Expressionism style of architecture. The Chilehaus building is famed for its top, which is reminiscent of a ship’s prow, and the facades, which meet at a very sharp angle at the corner of the Pumpen- and Niedernstrasse.