teacher had used invisible ink on all our papes… grading of each other’s classmates’ papers. Thought I happened to have a compatible pen, but not. Teacher had limited, so I picked a rock to sit on and waited. When I woke up (on the rock), they had all left.. moved on to the next segment of the field trip I guess. So I got on the trail and looked for them. Hit several spots.. crossed paths with many other tourists.. Ended up in one large exhibit center in which I entered a room where they were explaining how there was a point in time (early aviation? certain period in history?) where people could buy plane seats for their pets (a separate compartment in plane…), and it was two pets to a seat… There was a big display of them… various dogs (maybe cats too? I only remember dogs) all in the seats, mostly two to a seat.. And I was in that room for a bit with their explanation.. I don’t remember much else.