Industrial city, electropolis, global metropolis. Berlins rapid development began more than 100 years ago. Within the space of 30 years, the population grew from 500,000 to 4 million inhabitants. In 1920, Berlin was the third-largest city on the planet. The boom was triggered by the factories. Many of them still exist today, albeit mostly as ruins. A bike tour around the palaces of the last century – all ruins can be specified in the Bike Citizens App as a target destination.
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