1900–1945 • 1901 – Civil law courts built. • 1904 – American Businessmen's Club of Hamburg founded. • Gewerkschaftlich-Genossenschaftliche Versicherungsaktiengesellschaft (insurance firm) in business. • 1922 –
Museum of Hamburg History opens. • 1923 –
Labour and Socialist International founded in Hamburg. • 1924 •
Nordische Rundfunk radio begins broadcasting. •
Chilehaus built. • 1925 •
Helms-Museum and
Hamburg School of Astrology established. • Population: 1,079,126. • 1926 –
Botanischer Sondergarten Wandsbek (garden) established. • 1930 •
Planten un Blomen (park) created. • Population: 1,145,124. • 1933 •
Nazis seize control of the city and
Carl Vincent Krogmann becomes mayor. •
Hamburger Flugzeugbau (aircraft company) in business. • Fuhlsbüttel concentration camp founded. • 1934 •
Bürgerschaft abolished. •
Gau Hamburg established. •
Transmitter Hamburg-Billstedt begins operating. • 1937 • major expansion of the land of Hamburg per the
Greater Hamburg Act: • the cities
Altona,
Wandsbek, and
Harburg-Wilhelmsburg join • and the cities
Geesthacht and
Cuxhaven (including Neuwerk) leave the territory of the Land Hamburg. • 1938 –
Neuengamme concentration camp established by
SS. • 1939 –
Bombing of Hamburg in World War II begins. • 1940 – April:
Oflag X-D prisoner-of-war camp for
Allied officers established. • 1943 • May:
Langer Morgen forced labour camp for men established. • 7 August: Main base of the 2nd
SS construction brigade (forced labour camp) relocated from
Bremen to Hamburg. • 1944 • April: 2nd SS construction brigade relocated to
Berlin. • July: Hamburg-Veddel subcamp of the Neuengamme concentration camp established. The prisoners were
Jewish women. • 1 September: Hamburg-Wandsbek subcamp of Ravensbrück reorganized into a
subcamp of the Neuengamme concentration camp. • 13 September: Hamburg-Neugraben and Hamburg-Sasel subcamps of the Neuengamme concentration camp established. The prisoners were Jewish women. • 13 September: Women prisoners of the Hamburg-Veddel subcamp moved to other subcamps in Hamburg and
Wedel. • 27 September: Hamburg-Eidelstedt subcamp of the Neuengamme concentration camp established. The prisoners were Jewish women. • October: Hamburg-Finkenwerder subcamp of the Neuengamme concentration camp established. The prisoners were mostly Soviet, Polish, Belgian,
French and
Danish men. • November: Subcamp of the Neuengamme concentration camp established by the SS at the
Spaldingstraße for men of various nationalities. •
L'Obstinée masonic lodge established by Belgian POWs in the Oflag X-D POW camp. • 1945 • 8 February: Hamburg-Neugraben subcamp of Neuengamme dissolved and Hamburg-Tiefstack subcamp founded. Surviving prisoners moved from the Hamburg-Neugraben to the Hamburg-Tiefstack subcamp. • March: 250
Romani and
Sinti women deported to the Hamburg-Langenhorn subcamp of Neuengamme from the
Ravensbrück concentration camp. •
Constitution of Hamburg ratified. • 1955 –
Hamburg State Opera building opens. • 1957 •
Fazle Omar Mosque built. •
British Army School and
Hamburg Symphony Orchestra established. • 1958 –
Hamburg Atlantic Line in business. • 1959 –
Kaiserkeller night club opens. • 1960 – August: English rock band
The Beatles begin performing in Hamburg. • 1961 – Population: 1,840,543. • 1962 •
Spiegel scandal. •
North Sea flood of 1962. • 1963 •
Millerntor-Stadion (stadium) opens. •
St. James' Church restored. •
Alter Botanischer Garten Hamburg greenhouses built. • 1964 -
Deutsches Übersee-Institut headquartered in Hamburg. • 1965 •
Gruner + Jahr publisher in business. •
Hamburg Transport Association established. • Imam Ali Mosque built. •
NDR Fernsehen (television) headquartered in city. • 1967 – Eros Center brothel in business on the
Reeperbahn. • 1968 • Cherry Blossom Festival begins. •
Alsterdorfer Sporthalle and
Gruenspan music club open. • 1969 – waived older rights on harbour estate in Cuxhaven in favour of Neuwerk and Scharhörn to build an offshore harbour. • 1970 •
Hamburg University of Applied Sciences founded. • Population: 1,793,640. • 1971 – • 1978 • July: City hosts the
1978 World Fencing Championships. •
Technical University of Hamburg founded. • 1979 •
Botanischer Garten Hamburg (garden) opens. • Werkstatt 3 co-operative founded in Ottensen. • 1985 •
Birdland jazz club opens. •
Museum der Arbeit established. • 1986 •
Chaos Computer Club headquartered in city. •
Radio Hamburg begins broadcasting. •
Hamburg Marathon begins. •
Brokdorf Nuclear Power Plant commissioned near city. • 1988 • Center for Science and International Security at the University of Hamburg founded. and
Roman Catholic Archdiocese of Hamburg established. • 1996 – City website online (approximate date). • 1997 –
Ortwin Runde becomes mayor. • 1998 •
Afghan Museum established. •
Am Rothenbaum (sport venue) built. • 2000 •
Bucerius Law School established. •
International Tribunal for the Law of the Sea headquartered in city. ==21st century==