I liked watching beauty through the decades videos because it gives us a glimpse of how things once was like.
Of course those are limited to:
1. Western beauty ideals; and
2. Beauty ideals that were set by the wealthy (because they can afford it).
These videos underscore how no matter how much things change, some things remain the same. Women are expected to look a certain way (and suffer to get it if they didn't win the genetics lottery) to be considered beautiful. The beauty standards are often arbitrary and fickle; thick eyebrows one decade, pencil thin the next.
Here is another such video with an interesting twist. (Stolen from here)
It's a good refresher. Women are forever being erased from the history books as though half of the world's population have no historical value or did anything interesting enough to be noted. It is important to remind ourselves that women are not just vainpots primping in front of the mirror; they move the world as well.