Read before you go is a motto worth keeping.
I have mentioned Dan Brown's books on Paris and Prague.
One of my favorites is "The City of Falling Angels" about Venice
and the fire at the La Fenice Opera House.
There are plenty of guides about these places but they come clear in these novels.
The Alhambra in Granada Spain is like that.
Washington Irving wrote "Rip Ban Winkle" and The Legend of Sleepy Hollow"
but he also wrote "The Tales of the Alhambra" and there is a plaque
in the room where he stayed.