The conservatory of “The Causeway,” or James Parmelee house, Northwest Washington, D.C., 1919, by Frances Benjamin Johnston, via Library of Congress Prints and Photographs Division.
The estate has also been called Twin Oaks and Tregaron. Its 1912 house still stands, and some of the land is a campus for the Washington International School.
James Parmelee was a Cleveland financier and co-founder of the National Carbon Company.
More winter gardens are here.
enclos*ure 