Think about what our future offspring, and societies will think of us, when they reflect on our culture in 2000 years.
What do you suppose they will theorize?
What will they find about our cultures?
What do you suppose they will THINK of us?
This requires imagination, but can really be interesting.
Also, most historians look at skeletal remains, and embalming methods, and customs of rites, and funerals, in addition to our 'diaries' and writings..
This should be pretty interesting.