Challenges from Exploding Steamboats discussion

These 27 prompts reflect uncompleted prompts from my 2017 Personal Reading Challenge and various other challenges I foolishly took on. The first 10 are summer-specific for me, but don't feel like you need to limit yourself to seasonal reading. The asterisk indicates that I've failed it at least two years in a row and must complete it before I can count any other prompts as completed. (You are perfectly welcome to ignore this self-flagellation.)

I'm not including my Abandoned Book Rescue fails on this list, as I will address them in the 2018 Abandoned Book Rescue challenge.

A forgotten classic
A book of short stories
A book you heard about online
A book that scares you
A book that became a movie
A book published this year
A book set on a different continent
A book based on a true story
The second book in a series
A book with a number in the title

* A book from Oprah's Book Club
An armchair travel book
A steampunk novel
A book with a month or day of the week in the title
A book set in a hotel
A book recommended by an author you love
Any novel by a Damon Knight Memorial Grand Master
A book about sports
A book set within 100 miles of your location
A nonfiction book about technology
A collection of poetry in translation on a theme other than love
The oldest book in your TBR pile/list
A book in translation
A book by an indigenous person
A book that takes place in your state
A book you picked based on its cover
A nonfiction book about nature

Question: what is a "forgotten" classic?

I am not sure, so interpret it however you like. :-) I'm considering it something that is considered a classic but that isn't constantly popping up on "classics you must read" lists. I'm going with The Conjure Woman.

Later today I'll be posting prompt threads. For some of them, I'll link to other discussion threads where people posted suggestions. Like that poetry one. I mean, wow.

I just removed two prompts (mentioned in another book and classic by a non-European) because it turns out I had completed them for the 2017 challenge they were in. Yay!