Located on a scenic 54-acre property in Berwyn, the Upper Main Line YMCA Environmental and STEM Education Complex offers seasonal programming, summer camps and special events as well as outreach activities and field trips.
The grounds are open from dawn to dusk, seven days a week for exploration of our walking trails of the preserve.
The Cassatt Preserve has over 20-acres of diverse habitats including woodlands, wetlands, a meadow, the headwaters of Darby Creek, plus over 5 miles of trails. Over 130 species of birds have been recorded throughout the preserve. Be sure to explore our offerings including bird walks, hikes, canoeing and more.
The Nature Center, which opened in 1998, is the home of our 19 animal ambassadors. Visitors, campers and students all enjoy meeting our animal ambassadors and learning more about the myriad of insects, reptiles and mammals housed in the Nature Center. From Sparky, our 22-year-old snapping turtle, to Moira Rose, our recently adopted rabbit, there is something for everyone to see and love.
Micro Farm & Barnyard
Our barnyard is home to a colorful cast of goats, sheep and chickens. It is a popular destination for visitors to interact with farm animals right here on the Main Line. Throughout the year, our students and campers learn about the importance of farms and the daily work required while enjoying the company of our farm's animal residents.
Our Raptor Center is the home to various species of hawks and owls. All of our resident birds arrived from wildlife rehabilitation centers with a permanent disability that makes them unable to be released back to the wild. They work alongside our raptor care team as educational ambassadors for their wild counterparts.
Our complex has two STEM Labs for all of your scientific needs! Whether it's making elephant toothpaste, building robot courses or testing our favorite candy's floatability, we are having fun with STEM for all ages.
In our Watershed Lab students learn about the importance of water systems including: macroinvertebrates, water testing, stream erosion, plant life and more. With access to the Darby Creek, our watershed lab gives students hands on experience in the study of our water systems.
More Information about the UMLY Environmental and STEM Education Complex
The Cassatt Mansion was built in 1906-1908 as part of the Cassatt family’s 120-acre summer country estate known as “Kelso”.
J. Gardner Cassatt, a successful banker in Philadelphia, had the estate built as a summer country home, which included the mansion, carriage house, garage, barn and several outbuildings. Cassatt’s daughter, Ellen Mary, and husband Horace Hare, later took ownership of the estate and raised their two children, Gardner and Ellen Mary, here through the 1940s.
The estate was sold in 1950 to the Daylesford Abbey, a Norbertine community of Catholic priests and brothers.
The Daylesford Abbey operated on the campus from 1950 until 1961, when they moved to their current location just down the road.
The Upper Main Line YMCA started in 1962, operating from the T/E Middle School gymnasium. The Y purchased the former Cassatt estate from the Daylesford Abbey and began serving the community from the campus in 1964.
Meet our Team