The honey locust tree became prevalent in Midwest horticulture after the demise of the American elm tree due to Dutch elm disease in the early 20th century. Loved by landscape architects Alfred Caldwell and Dan Kiley for its slender trunk and thorny branches, the tree is a natural foil to some of the most highly regarded buildings of the era, including S.R. Crown Hall at the Illinois Institute of Technology.  Photo 5 of 5 in The Modernist’s Tree