The Speicherstadt (literally: 'City of Warehouses', meaning warehouse district) in Hamburg,is the largest warehouse district in the world where the buildings stand on timber-pile foundations, oak logs, in this particular case. It is located in the port of Hamburg—within the HafenCity quarter—and was built from 1883 to 1927.The district was built as a free zone to transfer goods without paying customs. As of 2009 the district and the surrounding area is under redevelopment. As the first site in Hamburg, it has been awarded the status of UNESCO World Heritage Site on 5 July 2015.Since 1815, the independent and sovereign city of Hamburg was a member of the German Confederation—the association of Central European states created by the Congress of Vienna—but not member of the German Customs Union. With the establishment of the German Empire in 1871, Hamburg could not be a customs free zone and part of the German Empire. Due to treaties of 1888 Hamburg was part of the German customs zone and a free port was established.