Ten historic postal buildings: the General Post Offices of Dublin, Sydney, Melbourne, Kolkata and Mumbai; Singapore Fullerton Building; Washington Old Post Office; New York Farley Building; Madrid Cibeles Palace; and Saigon Central Post Office in Ho Chi Minh City. This selection is not an age or size ranking. Former postal buildings are included honestly: Fullerton became a hotel, Melbourne a retail space, Cibeles a city hall, and part of Farley Moynihan Train Hall. The founding date of a postal institution does not date a particular building. Photographs do not establish current opening or visiting conditions. All photographs carry stated open licenses. Dublin General Post Office: ClaireWhi; CC0 1.0; https://creativecommons.org/publicdomain/zero/1.0/; https://commons.wikimedia.org/wiki/File:The_GPO%2C_General_Post_Office_IN_Dublin%2C_Ireland.jpg; resized and fitted to portrait frame; derived image retains the source license. Sydney General Post Office: Maksym Kozlenko; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:General_Post_Office%2C_Sydney.jpg; resized and fitted to portrait frame; derived image retains the source license. Melbourne General Post Office: HappyWaldo; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Melbourne_GPO_2020.jpg; resized and fitted to portrait frame; derived image retains the source license. Fullerton Building: Ralff Nestor Nacor; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:The_Fullerton_Hotel%2C_Singapore%2C_August_2023.jpg; resized and fitted to portrait frame; derived image retains the source license. Kolkata General Post Office: Rangan Datta Wiki; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:General_Post_Office_%28GPO%29%2C_Kolkata.jpg; resized and fitted to portrait frame; derived image retains the source license. Mumbai General Post Office: No machine-readable author provided. QuartierLatin1968 assumed (based on copyright claims).; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Mumbai_General_Post_Office.jpg; resized and fitted to portrait frame; derived image retains the source license. Washington Old Post Office: Photograph by Mike Peel ( www.mikepeel.net ).; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Old_Post_Office_Building%2C_Washington%2C_D.C.jpg; resized and fitted to portrait frame; derived image retains the source license. James A. Farley Building: Addis Wang; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:James_A._Farley_Post_Office_Building.jpg; resized and fitted to portrait frame; derived image retains the source license. Cibeles Palace: Yann Droneaud from Paris, France; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0/; https://commons.wikimedia.org/wiki/File:Madrid_-_Palacio_de_Comunicaciones.jpg; resized and fitted to portrait frame; derived image retains the source license. Saigon Central Post Office: David Stanley; CC BY 4.0; https://creativecommons.org/licenses/by/4.0/; https://commons.wikimedia.org/wiki/File:Saigon_Central_Post_Office_2025.jpg; resized and fitted to portrait frame; derived image retains the source license.