Ten historic glasshouses: the Palm Houses at Kew, Schonbrunn, Belfast and Copenhagen; Berlin Great Tropical House; New York Haupt Conservatory; Royal Greenhouses of Laeken; Helsinki Winter Garden; Adelaide Palm House; and Kibble Palace in Glasgow. This is a selection, not an age or size ranking. Laeken counts as one complex. Berlin was rebuilt after wartime destruction; other landmarks also underwent restoration. Kibble Palace was relocated and enlarged. Adelaide Palm House was imported from Bremen. Archival photographs do not establish current visiting conditions. All photographs carry the stated open licenses. Kew Palm House: Daniel Baránek; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:London%2C_Kew_Gardens%2C_Palm_House%2C_01.jpg; resized and fitted to portrait frame; derived image retains the source license. Schonbrunn Palm House: Martin Falbisoner; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Palmenhaus_at_Schoenbrunn_Palace%2C_September_2016.jpg; resized and fitted to portrait frame; derived image retains the source license. Belfast Palm House: Glenn Quigley; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Palm_House%2C_Botanic_Gardens%2C_Belfast.jpg; resized and fitted to portrait frame; derived image retains the source license. Copenhagen Palm House: Ardfern; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Palm_House%2C_Copenhagen%2C_May_2015.JPG; resized and fitted to portrait frame; derived image retains the source license. Great Tropical House: Dguendel; CC BY 4.0; https://creativecommons.org/licenses/by/4.0/; https://commons.wikimedia.org/wiki/File:Berlin-Dahlem%2C_botanischer_Garten%2C_das_gro%C3%9Fe_Tropenhaus.JPG; resized and fitted to portrait frame; derived image retains the source license. Haupt Conservatory: Jim.henderson; CC0 1.0; https://creativecommons.org/publicdomain/zero/1.0/; https://commons.wikimedia.org/wiki/File:Haupt_Conservatory_NYBG_jeh.jpg; resized and fitted to portrait frame; derived image retains the source license. Royal Greenhouses of Laeken: Michiel Dumon; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Laeken_Royal_Greenhouses_%286%29.jpg; resized and fitted to portrait frame; derived image retains the source license. Helsinki Winter Garden: Paasikivi; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Winter_Garden%2C_Helsinki_01.jpg; resized and fitted to portrait frame; derived image retains the source license. Adelaide Palm House: Ashton 29; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Palm_House%2C_Adelaide_Botanic_Gardens.jpg; resized and fitted to portrait frame; derived image retains the source license. Kibble Palace: Charles01; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Kibble_palace_exterior_in_winter_sun.JPG; resized and fitted to portrait frame; derived image retains the source license.