From the Spring National Trust for Preservation magazine "Gardens At National Trust Historic Sites Provide a Breath of Fresh Air."
They listed and wrote about four of them. I am quite the person for flower gardens.
1. LYNDHURST-- Tarrytown, New York On the Hudson River.
2. THE SHADOWS-- New Iberia, Louisiana Former plantation. Concentrates on shade plants.
3. BELLE GROVE-- Middleton, Virginia
4. BRUCEMORE-- Cedar Rapids, Iowa
So, Next Time Traveling, Stop and Smell the Roses.