The ones I actually personally subscribed to as a kid in the late 70s and early 80s were National Geographic World (their kids' magazine of the era) and Star & Sky, an astronomy magazine.

Before that, we'd gotten Humpty Dumpty and Children's Digest. I remember the latter serialized Tintin comics, but the issue that really sticks in my head is the one that reprinted the "Riddles in the Dark" chapter of The Hobbit. That was my first encounter with Tolkien, and, man... that fired my imagination.

My parents got National Geographic, Smithsonian, I think U. S. News and World Report for a while, and I'd read those. Mom got Psychology Today, sometimes I'd read that. In the 80s they subscribed to Scientific American and Science 80-81-82 etc. Scientific American was an absolutely top-notch publication in those days with most of the articles written by original researchers.

Before the Internet, this was how you got popular info-tainment types of reading.