airman62

There are actually 3 old SFO international terminals:
When what is now terminal 2, or once the Central Terminal, opened in the 1950's, international flights used what later became the PSA/Northwest Orient/Hughes Airwest/National concourse.
When the South Terminal (now terminal 1) opened in the early 60's, the first concourse on the west side was the international pier, and customs/immigration was located down below. In the 70's a rotunda was added at the end of this pier, as part of what would have been an aggressive remodel of the entire airport, that never progressed beyond this. The rotunda was not attached to the end of the original international pier, but off to the side, you had to make a sharp right at the end of the original concourse to go into the rotunda. What was really cool about this location was that you could go out and meet international flights, and follow the arriving passengers into the terminal, they were behind glass walls until they went downstairs into the immigration hall.
The original Central Terminal was remodeled in the early 80's into the present shape that is Terminal 2 today, and international flights used that until the new international terminal opened approximately 7 years ago. PSA and later USAir (and others) used the old rotunda terminal until is was finally razed about a year ago. It stood between the south pier of the current international terminal and the Alaska/CO/WN/US concourse.