Anthropology

which may illuminate things far more than we know now, like the fantastic ground-penetrating, jungle penetrating cameras being created and refined, from seeing things buried under the sand, in Egypt, to innumerable "lost" cities in the Americas.

Hope you will be able to return to see newly uncovered places to add to your list.

Really envy your experience with the ones you've already visited. The images online are fascinating.

Creepy realizing how many locals have made off with meaningful pieces of the prehistoric civilizations. Happens all over the world. They just can't help themselves, apparently.