Slayton Arboretum, 14 acres, is an arboretum located adjacent to the campus of Hillsdale College in Hillsdale, Michigan. It is privately owned but open to the public.
Although the site's use by the College students dates back to at least the 1860s, the Arboretum began in 1922 when Mr. and Mrs. George A. Slayton donated 14 acres to Hillsdale College. By 1924, the first donated plantings were in place, led by Professor Bertram A. Barber. A pond was excavated in 1928, and a field station, a hillside rock garden, waterfall, and pump house were added in 1929. In the early 1930s two bridges were added, and an amphitheater built in the late 1930s on the site of a former gravel pit.
Wikipedia https://en.wikipedia.org/wiki/Slayton_Arboretum
Address Hillsdale 49242, United States
Coordinates 41°56'6.512" N -84°37'40.355" E