The United States Botanic Garden, near the Capitol building and near the hotel where I just was for a conference, has a display going on called "Celebrating America's Public Gardens." A total of 20 gardens are featured, 12 of them with outdoor displays. After hours, as dark was falling, Paul showed me what he had discovered by accident earlier in his wanderings: the North Carolina Botanical Garden's outdoor display featuring its signature carnivorous plants, longleaf pines, and other native plants of eastern North Carolina.
Here's the NCBG's story, with pictures, about the building of the boardwalk, etc. to create the garden exhibit. "Celebrating America's Public Gardens" extends through October 8.