In this months This Old Tree host Doug Still explores The Mies van der Rohe Honeylocust of the Alfred Caldwell Grove. A big, old, thorny honeylocust tree on the campus of the Illinois Institute of Technology in Chicago has a place within the history of modernist architecture and landscape design. How so? Professor and landscape architect Ron Henderson talks about the tree's relationship to Mies van der Rohe and his colleague Alfred Caldwell, and how the honeylocust became the feathery urban forest powerhouse it is today.