Dumbarton Oaks "... is a milestone in the history of American landscape architecture and a landmark in our social history, as it represents the finest work of Beatrix Farrand, America’s first professional female landscape architect." (https://dopark.org/about/)
The park holds and has hosted a lot of history in DC, highlighted in this short video. Recipients of the Bliss Symposium Award have published moving reflections on environmental histories and can be read here.
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Photo Credit: National Park Service