Um, what do I read and why?
I will only list one 19th century (A Prisoner of Zenda by Anthony Hope), and one 20th century (The War Hound and the World's Pain by Michael Moorcock) novel, because otherwise the list will get too long, so I'll mostly limit myself to some 21st century works.
Firebrd by R. Garcia y Robertson
Jonathan Strange & Mr Norrell by Susanna Clarke
The Invisible Library by Genevieve Cogman
A Darker Shade of Magic by V. E. Schwab
Hell Is the Absence of God by Ted Chiang
The Buried Giant by Kazuo Ishiguro
I suppose all of them involve humans encountering the fantastic?