Remnants of a 200-year-old stone barn, a springhouse, protected forests, abundant wildlife and a 55-acre arboretum paint a scene of incredible beauty and tranquility. Formal gardens and terraces surround the venerable estate house, its earliest roots traced back to the 1740s. Listed on the National Historic Register, the residence lends a time-honored backdrop for indoor/outdoor events. Welkinweir is the home of Green Valley Association, a not-for-profit organization with a mission to protect and preserve the water resources of Northern Chester County through advocacy and education.