Over the past four months we’ve been visiting the construction site of 1 WTC and the Calatrava Transit Hub and showing you images from inside. Yesterday, the passageway between station World Trade Center PATH station and the new Brookfield Place Pavilion at the World Financial Center opened officially, featuring the signature ribs of the Santiago Calatrava design. This marks the first time that a commuter concourse has been open at the World Trade Center since 9/11. Eventually this will be filled with retail, so go now to revel in its most architecturally pure state. For a critical angle, read the article on Next City by Stephen J Smith who estimates that this tunnel alone cost $100 million, of the bloated $4 billion price tag for the transit hub.