The Climatron is a greenhouse enclosed in a geodesic dome that is part of the Missouri Botanical Garden in St. Louis. Initiated by then-Garden director Frits W. Went, the dome is the world's first completely air-conditioned greenhouse and the first geodesic dome to be enclosed in rigid Plexiglass panels.

NOTE: In years past the botanic garden has provided a catalogue of plant materials used in each display, but unfortunately I can’t find one this year.

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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.

My traditional US Capitol picture, posted earlier: