If you're interested in ancient history, you might enjoy the documentary by the Smithsonian, Secrets: The Sphinx. We watched it on Netflix this evening and found it to be interesting speculation. A summary from the Smithsonian:
It stands as tall as a six-story building and is the length of a jumbo jet. Egypt's Great Sphinx is the biggest single stone statue in existence, and the mysteries surrounding it are equally sizable. When was the monument built, and why? Was it an act of devotion or part of a much larger plan? Join a team of international investigators as they attempt to shed new light on these age-old questions, using the latest research and techniques in order to solve the complex riddle of the Sphinx once and for all.You can watch a few brief videos of the documentary on the Smithsonian website. It's also going to be aired on the Smithsonian TV channel in March.
Image ~ Giza Plateau - Great Sphinx with Pyramid of Khafre in background, Daniel Mayer CC 4.0
