How Philadelphia's Old Money Built a Line of Mansions and Then Walled Itself In: The Main Line

0:00 The house that did not survive 1:52 The railroad creates the Main Line 4:01 Alexander Cassatt and the first estates 10:42 The architecture of wealth 13:53 The price of belonging 17:19 Why the mansions disappeared 25:47 Keeping the estate and closing the gate 29:39 What survives and what remains closed What happens when a railroad opens the countryside to wealth—and the gates close behind it? I trace the rise and fall of Philadelphia’s Main Line through the estates that made Lower Merion and Radnor famous. I follow Alexander Cassatt, Cheswold, Woodmont, Penshurst, Ardrossan, and La Ronda, examining how railroads, architecture, fortunes, servants, and land shaped this suburban landscape. I also look at the restrictions, school segregation, and racial covenants that helped decide who could live there. Finally, I examine why some mansions were demolished, why others survived through institutional use or preservation, and how conservation easements, zoning, and private roads continue the story of access and enclosure.