Some examples would be the hobbit and a wrinkle in time
A Wizard of Earthsea by Ursula K. Le Guin. I used the first book as a palate cleanser after finishing Blood Meridian. It’s very whimsical and playful in many aspects but also builds out a beautiful world that you can definitely lose yourself in.
This is a wonderful series.
I really think A Series of Unfortunate Events is so worth a read as an adult. It’s fun, meta, plays with its presentation of words on a page. And towards the end the story dovetails into allegory and metaphor, which is a lot more than I bargained for in a children’s book.
Also, finding all the little literary references as an adult is fun! I definitely didn’t pick up on, like, anything when I was a kid, but there are quite a few.
Hatchet by Gary Paulsen was quite the page Turner for young me.
I never read this one as a kid, but finally read it last year. Pretty enjoyable- it felt plausible enough that you could believe he was surviving out there.
I enjoyed rereading ‘Mrs. Frisby and the Rats of NIHM.’ And also ‘Bunnicula’ for a bit of silliness.
Bunnicula is one of the best silly books ever written.
The Moomin series, perhaps? Went over the head of my children, but I thoroughly enjoy them myself. Especially the later ones, which are rather melancholic
I will always, always, always recommend anything by Diana Wynne Jones. I re-read Howl’s Moving Castle at least once a year and it’s always a delight; it’s whimsical, it’s hilarious, it’s got an adorable romance, it’s got it all. If you’ve seen the Ghibli movie adaptation, it’s definitely its own take; I would recommend reading the book for a very different, but still lovely experience. I also love Fire and Hemlock by her, although it might be harder to find.
The Uglies series by Scott Westerfeld is on the cusp of childrens’ and teen lit - I read the books when I was in middle school (so ages 11-14) and reread them pretty often as well. They deal with heavier stuff and I always find something new in my rereads; while the books were written with a critique of plastic surgery in mind, they’re even more relevant in today’s social media landscape. The writing style is fairly simple but the ideas are extremely rich, and the relationships between the characters are just fantastic.
An all-ages one that many people don’t realize is a book: The Princess Bride! Actually read it for the first time towards the end of college, and it’s really good fun. If you’ve seen the movie, you know exactly what to expect, but it doesn’t take away from the experience at all.
I read the His Dark Materials trilogy for the first time when I was an adult and really enjoyed it. Lots of interesting ideas and the characters have stuck with me! Pullman has also released two out of the three books of a sequel-ish trilogy and when that series is complete I plan to read that one as well!
I really liked it as well. Check out the prequel series, A Book of Dust. It’s really good as well.
Harry Potter seems like a given!
Guess that might be a bit more YA though but if we can coun’t those as well then I’d add The City of Ember by Jeanne DuPrau as well (the movie is pretty nice as well!)