YouTube now has an "edu" section for college and university videos and channels. Search by topic, directory, most subscribed, most viewed. Lots of videos on commencement, on promoting the campus or welcoming students, lectures, and special events. UCBerkeley, Stanford, CSU Sonoma State, UCDavis, and UCLA each have hundreds of videos. The number and quality will continue to grow.
High School students and their parents may want to check out this site when doing research on colleges or planning campus visits.