If, like me, you're interested in ancient Egypt, or just want to learn more about the Great Sphinx, pyramids of Giza, and other monuments that have survived thousands of years in the desert sands, watch the NOVA program Riddles of the Sphinx.
The program covers the purpose for the Sphinx's creation, investigates theories about its construction, and discusses the excavation and restoration efforts of the Romans, Greeks, and various European groups.
Here's the description from the NOVA page:
For 45 centuries, the Great Sphinx has cast its enigmatic gaze over Egypt's Giza Plateau. The biggest and oldest statue in a land of colossal ancient monuments, its scale is staggering: The mighty head towers as tall as the White House, while its body is nearly the length of a football field.
This strange half-human, half-lion image has inspired countless fantastic theories about its origins. How was it built, and who or what does it represent? Surprisingly, the scribes of the period when it was built—during Egypt's Old Kingdom—passed over it in silence. Adding to the mystery, archeologists found that its creators abruptly discarded their tools and abandoned the Sphinx when it was nearly complete.Searching for clues, NOVA's expert team of archeologists, including Mark Lehner (director, Ancient Egypt Research Associates), carries out eye-opening experiments that reveal the techniques and incredible labor that was invested in the carving of this gigantic sculpture. The team also unearths new discoveries about the people who built the Sphinx and why they created such a haunting and stupendous image.