Free Things To Do In Boston: The Arnold Arboretum Of Harvard University

The Arnold Arboretum was founded in 1872, right around the same time that Charles Darwin published "On The Origin of Species," laying out his ideas on the theory of evolution. The arboretum continues to be a place for scientific research, and collects plants from all over the world.
Visit their website for more, like events and self-guided tours: wbur.fm/2fGj9EW