Nova is a part of PBS that is dedicated to making cool documentaries that explore the history and development of many different theories, practices, ideas, and subjects. Most of the series they make are about science, but not all. Here are a few of that I have watched and enjoyed:
The Elegant Universe
Eleven dimensions, parallel universes, and a world made out of strings. It's not science fiction, it's string theory.
The story of the harnessing of cold and the race to reach the lowest temperature possible
Secrets of the Parthenon
How did the ancient Athenians build this near-flawless icon of Greece's golden age?
Judgment Day: Intelligent Design on Trial
Science is 'Exhibit A' in a landmark trial on the teaching of evolution.