The Speicherstadt is one of the main attractions in the great harbour tour. The world's largest integrated complex of warehouses was built in 1883, five years before Hamburg received its free port. Since 1991, the unique district has been given historic monument protection. The warehouses are built on oak piles and the district is crossed by what are known as fleets - canals that are flooded depending on the tides and can then also be travelled by ship. You can travel the narrow canals in small barges to savour the architectural details if the tide is right. A canal tour with a historic barge like this is an unforgettable experience. Most tours depart from the landing stages in St. Pauli. Groups can even charter a whole barge. The world´s largest contiguous warehouse complex is located in the Freihafen between Deichtorhallen and Baumwall. In July 2015 the whole complex has been nominated as a UNESCO- world cultural heritage site.