Edinburgh
Royal botanic garden edinburgh (rbge) is a world-renowned scientific centre for the study of plants, their diversity and conservation.
http://www.rbge.org.uk/
Kew-Wakehurst
Kew-Wakehurst
http://www.rbgkew.org.uk/visitor/index.html
Northampton
The botanic garden of smith college, northampton, ma. includes the lyman conservatory and photo gallery.
http://www.smith.edu/garden/