An unforgettable event occurred.
This is the unforgettable place where we met each other for the first time.
That was the most unforgettable meal that I've ever eaten.
This was an unforgettable trip.
I was an unforgettable breath-taking view.
That trip was probably one of the most unforgettable experiences of my life.
Seeing Niagara Falls was an unforgettable experience.
That view is unforgettable, you gotta go there and see it.
A parachute jump can be an unforgettable experience.
It was unforgettable.
Today has been unforgettable. I’ll remember it forever.
One receives unforgettable impressions of scenery and local life.