Dubuque Arboretum & Botanical Gardens Today's Adventure 21 Nov, 2014 Bridge Over Still Water Hoar Frost Every season is beautiful at the Dubuque Arboretum and Botanical Gardens. Even now, when robins have fled, waterfalls are silent and the koi pond is frozen, vignettes remain to please the eye. cold beauty Still Life Snow Cap Kale Koi Pond