Old Main

Old Main is a term often applied to the original building present on college or university campuses in the United States. The building often serves as home to administrative offices, such as president or provost. The building also serves as a focal point of the institution and common location to which all alumni relate. Many old main buildings are surmounted by a large tower, cupola, or spire often housing a bell or carillon. Some examples (sorted by U.S. state):

...
Wikipedia