I remember "the explorers" as being a big thing that was taught in my school system in elementary school and we dutifully learned all the names of the European explorers and where they went, etc. My goodness, we were parochial in our approach to history. So, what was fascinating for me was the scope of these lectures. They went back further into history, covering the ancient Greeks, and they were more global, not limited to European white males. Each lecture covered one explorer or exploration telling the story of the exploration and then commenting on its significance, why it was a pivotal moment human history.