World War II
I got interested in WWII history after I had talked to someone on the islands of the Pacific where major battles occured in the war. I have QSL cards from places like Iwo Jima, Minami Tori Shima, Truk Island, and etc. I also did a few things like run a phone patch from some one in the office of a Catholic Priest in the Marshall Islands to the person's family in San Francisco, California.
Anthropology/Archeology
I got more interested in ancient man when a local forensic anthropologist showed up a "Bier Zeit". He had just found a skeleton and was really excited. The skeleton was later given the name of "Kennewick Man". You might wonder why I grouped anthropology and archeology. Well, there are no archeologist's in the USA. They are formally called anthropologists.
I encountered a book some time ago called "The Real Eve : Modern Man's Journey Out of Africa" by Stephen Oppenheimer. Chatter's commented on numerous occasions that current ethnic features didn't exist 10,000 years ago. There were archaic versions but they became more refined with time. So, a book that claims Eve was in Africa some 100,000 years ago, easily got my attention. The local Nez Perce, for example, have oral traditions that go back 10,000+ years. That is well beyond the 6500 years claimed for "Adam and Eve".