A Daniel Burnham masterpiece, fortunately preserved as luxury apartments (you have to go out back by the Dumpsters to catch a train). It was officially Union Station, but usually called Penn Station, since the railroads that were not owned by the Pennsylvania Railroad had their own separate stations.
The East Busway runs right past the building on part of the original railroad right-of-way.
We also have some close-up pictures of the terra-cotta decorations on Penn Station.