The Marriage of Ferdinand and Isabella
There are many videos about the role of Ferdinand and Isabella in the Spanish Inquisition, but I've chosen this video because it emphasizes Susan Wise Bauer's key point - the importance of the union between Isabella of Castile and Ferdinand of Aragon. This video is a school project, but it's a nicely done, concise explanation.
Age of Discovery: Spanish and Portuguese Explorations
Clip from Phoenix Film and Video