Have you ever got to a destination and been disappointed? The term "Paris Syndrome" was coined to express the collection of physical and psychological symptoms experienced by first-time visitors realizing that Paris isn't, in fact, what they thought it would be. I've never regretted visiting any country, city, or site, but I am guilty of building things up in my head beforehand.
The Starfield Library in Seoul is known for its massive bookcases. The pictures I saw on Instagram attracted me to go see it for myself. In my head I had envisioned endless stacks and escalators full of books as far as the eye could see, but that wasn't the case. There were two tall stacks with escalators. The library was still amazing to see in person & I don't regret going. It just wasn't what I had pictured.
When traveling we often create an imagine in our heads of the location before we even arrive. This is recipe for setting yourself up for disappointment and not appreciating the reality of the destination because it doesn't match your fictional ideas.
Doing research ahead of time isn't a bad thing, but always go in with an open mind. Don't try to create the memory before it's even happened.