In this podcast episode, we will be exploring the forgotten rail yard that lies beneath one of Chicago's largest and most iconic historic buildings. The building in question is a magnificent Beaux-Arts structure that has served many purposes over the years, including as a post office, library, and government center. But beneath the grandeur of this building lies a hidden history - a vast and intricate network of rail lines and tunnels that once carried mail, goods, and people through the heart of the city. We will delve into the history and architecture of this forgotten rail yard, including the unique challenges and opportunities posed by its underground location. We will also examine the cultural and social significance of the rail yard, including its role in shaping the identity of Chicago as a hub of transportation and commerce. Additionally, we will explore the challenges and opportunities facing the forgotten rail yard today, including efforts to preserve and protect this valuable piece of the city's history and heritage. Join us for a fascinating discussion on the forgotten rail yard under Chicago's largest historic building, and the important role it plays in the city's past, present, and future.