The Botanical Garden’s popular annual holiday display features model trains in the gated outdoor gardens; festive lights throughout the garden; and the poinsettias, holiday decor and D.C. landmarks made from plants inside the conservatory. On the lawn in the gated outdoor gardens, G-gauge model trains circulate 10 a.m.-5 p.m. daily through displays of pollinators made from plant parts. Closed December 25; runs through January 5th.