Manhattan's Port Authority Building is an important train, bus and coach interchange and quickly became very familiar to us when we stayed just metres away from one of its many entrances. I don't recall it being a very inspiring or attractive building but it was certainly well used.
I had forgotten we in Melbourne have our own Port Authority Building and it is lovely building. After bits began falling off the 1960s constructed Suncorp building in a block within Collins and William Streets and Flinders Lane, the Suncorp building was demolished and a lovely view of the Port Authority Building was opened up. The interior is mostly apartments now with some businesses at ground level. I can't decide which of these photos to use, so I've used both. Of course this view is only temporary. Something just as hideous as the demolished building will undoubtedly be built.