Hmmm, maybe the book Guns, Germs, and Steel would be an interesting start. It's a beefy and detailed book, but interesting. Definitely a broad overview. Also, I think the made it into a movie. That might be more digestible.
I've always like Dan Carlin's Hardcore History podcast. He covers a broad range of subjects but they're ways great!
Ancient China is also really awesome to learn about. It's not studied so much in the west but they had some extraordinarily advanced civilizations and cities well before those in Europe. Japan, Egypt, the Middle East all have pretty mind-blowing histories.
