That one is fun, though I would say that Grinch Night is the superior Grinch sequel

I thought it already had a sequel? (Admittedly, it is only a video sequel, but Grinch Night was a childhood fave)

I'd suggest Middlemarch by George Eliot and North and South by Elizabeth Gaskell (honestly, I'd recommend all of their works, both are brilliant authors, but these are the books that most often get recommended and put onto these types of lists)

The Man in the High Castle is definitely a book that stays with you. Dick even said that he refused to revisit it because it took such a toll on him to write it. (That said, it has an amazing tv adaptation that differs enough that both stand on their own as related, but separate entities)

No, by the time Dracula was written (about 70-80 years after Frankenstein) it had gone out of fashion in both novels and letter writing. I'm not 100% sure when it faded out of style, but it was a common trend that lasted at least until mid-way through the 1800's (for example, it was also done in the American book Uncle Tom's Cabin)

You've definitely got an interesting discussion on here, do you mind if I crosspost to r/PrideandPrejudice?

Same, there is so much more to a story than just the barebones plot. Getting not only the little details that would otherwise be skipped, but also an insight into the author's thoughts (Les Mis is more essay than book, so it does the latter especially well) makes for feeling like one has entered into that time

Three Musketeers by Alexandre Dumas (Dumas got paid by the line, which had an interesting effect on the work, mainly giving it a modern readability due to the dialogue-heavy scenes and comedic situations the characters constantly found themselves in)

Northanger Abbey by Jane Austen (the first written of her novels, it is definitely the most like YA, but in a definitely good way. The characters are relatable (you may not ever meet a Lady Catherine from Pride and Prejudice, but everyone knows a John Thorpe in their lives) and the satire is relatable. Just change out gothic romances for YA or crime thrillers, gigs for sport cars, and Bath for London or New York and the satire still holds up)

Don Quixote by Cervantes (absolutely hilarious, with scenes that feel straight out of Monty Python or a Terry Pratchett novel)

But then you'll miss out on the history of the Parisian sewer system

Northanger Abbey was the first novel Austen wrote after her Juvenalia, so it played with what being a novel even means (hence the lack of info about Eleanor's hubby) She also tended to skip over the marriage portion of her marriage plots and ended on the engagement with a quick aside about the wedding (iirc, the only divergence from this is with Mansfield Park where, instead of just stating that the marriage happened, Fanny also was pregnant)