The US Botanic Garden's First Conservatory   This 1858 photograph shows the Conservatory constructed eight years earlier. The accompanying grounds occupied ten acres extending from First Street to Third Street between Pennsylvania and Maryland Avenues, SW.   Brief History of the U.S. Botanic Garden Original Main Conservatory and the Bartholdi Fountain (Photograph) The Central Dome of the Old Main Conservatory (Photograph) The US Botanic Garden's First Conservatory (Photograph)

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