Expedition to Earth

I obviously read and was imprinted by a LOT of SF as an adolescent / young adult - because I haven't seen this collection since the late 1970s (lost in a suitcase somewhere on a far in Zambia), but I remember every story.

The Sentinel is brilliant - and a standalone precursor to 2001: ASO. The title story was superb. The rest - well, I plan to get another copy and read it again, through the revisionist lens of thinking Clarke's characterisations were pretty poor, BUT I liked the stories well enough that I want to reexperience them.