In 1910, the Pennsylvania Railroad accomplished the enormous engineering feat of building tunnels under New York City's Hudson and East Rivers, knitting together the entire eastern half of the United States. The tunnels terminated in what was one of the greatest architectural achievements of its time, Pennsylvania Station. Designed by renowned architect Charles McKim, and inspired by the Roman baths of Caracalla, Pennsylvania Station covered nearly eight acres and housed one of the largest public spaces in the world. Neither Cassatt nor McKim lived to see their masterpiece completed, but many of the 100,000 attendees of Penn Station's grand opening proclaimed it to be one of the wonders of the world. But 53 years after the station's opening, the financially-strapped Pennsylvania Railroad announced it had sold the air rights above Penn Station, and would tear down what had once been its crowning jewel to build Madison Square Garden, a high rise office building and sports complex. On the
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