Oddly enough, though I know I went on field trips at school...I cannot recall a single one.
The Museum of Natural History
When I lived in Mainz, Germany my class went to the Gutenberg Museum. I found it pretty cool, seeing the ancient books and printing presses.
I wouldn't call it a school trip, more like a teacher accompanied trip, we went to a small seaside city for a few days, it was wild
It was last year in Vienna in the Christmas markets.
The Bodies Exhibit in Atlanta
I think it' be visiting the state capitol in 9th grade.
In elementary level - 4th grade, maybe? It was a field trip that would, one day, help us to discover nature's mysteries. She pointed out various features and their names like: trunk, stem, dirt... and that might be a rock.
Dinosaur hunting. When I was in school we just pushed a stone wheel cart to a field. Gave all the kids clubs and wished them luck. Thank God for the introduction of fire!!