The Garden Pavilion building is located at the edge of Lake Nevin near the main entrance to the Bernheim Arboretum and Research Forest. Interestingly, the building looks square on their website.
*****
We visited the “Season’s Greenings: America’s Gardens!” exhibit at the United States Botanic Garden, featuring plant-based recreations of conservatories, fountains and sculptures from around the country, with model trains running around and above the displays. It's become an annual event for us, and we always enjoy the holiday creations as well as the traditional DC landmarks display (most of which I didn't photograph again this year) as well as the 3,000-plus varieties of pointsettias gracing the various halls.
Best to view in "Original" because other versions resized by Pbase are decidedly unsharp.
World War I cemetery at Gallipoli, posted earlier: