Ten historic gas holders and surviving outer houses: Oberhausen, the Vienna complex, Dresden Panometer, Leipzig Panometer, Schoneberg in Berlin, Boberg holder No. 1 in Stockholm, guiding frame No. 8 at London King's Cross, Augsburg, Turku and Ostre Gasvaerk in Copenhagen. This is a selection, not a size ranking. Berlin is shown in an archival 2010 photograph, Stockholm in a 2011 photograph. Open guiding frames are not sealed tanks. Historic shells have been converted, restored or relocated; these photographs do not establish current gas storage. Oberhausen Gasometer: Островский Александр, Киев|; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:NRW%2C_Oberhausen%2C_Gasometer.jpg; resized and fitted to portrait frame; derived image retains the source license. Vienna Gasometers: C.Stadler/Bwag; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Simmering_%28Wien%29_-_Gasometer_%281%29.JPG; resized and fitted to portrait frame; derived image retains the source license. Dresden Panometer: User:Kolossos; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Dresden-Panometer.jpg; resized and fitted to portrait frame; derived image retains the source license. Leipzig Panometer: Frank Vincentz; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Leipzig_-_Richard-Lehmann-Stra%C3%9Fe_114_-_Panometer_01_ies.jpg; resized and fitted to portrait frame; derived image retains the source license. Schoneberg Gasometer: Brücke-Osteuropa; Public domain (author dedication); https://commons.wikimedia.org/wiki/File:Berlin_Schoeneberg_Gasometer_1.JPG; https://commons.wikimedia.org/wiki/File:Berlin_Schoeneberg_Gasometer_1.JPG; resized and fitted to portrait frame; derived image retains the source license. Boberg Gas Holder: Holger.Ellgaard; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Bobergs_gasklocka_2011.jpg; resized and fitted to portrait frame; derived image retains the source license. Gasholder Park: AndyScott; CC0 1.0; https://creativecommons.org/publicdomain/zero/1.0/; https://commons.wikimedia.org/wiki/File:Gasholder_Park%2C_King%27s_Cross%2C_Gasholder_No_8_from_the_canal.jpg; resized and fitted to portrait frame; derived image retains the source license. Augsburg Gas Holder: Tiia Monto; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Augsburg_-_gas_tank.jpg; resized and fitted to portrait frame; derived image retains the source license. Turku Gasometer: Kmearl75; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Turku_gasometer_side.jpg; resized and fitted to portrait frame; derived image retains the source license. Ostre Gasvaerk: Nils Vest; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Oestre_Gasvaerk_-_Copenhagen.jpg; resized and fitted to portrait frame; derived image retains the source license.