In my youth, a long time ago, I used to take my bicycle and ride through Hamburg Harbour in a way it is not possible anymore. This was pre-container times and pre-security fences. Majestic freighters from all over the world with such a variety if goods. Stacked with crates. Loose cargo. Coal and grain. Cars and machinery.
A fascinating experience and sometimes a bit scary.
Now in modern container times, such proximity is not possible for 12 to 14 years old anymore.