I think the first movie that made me go "wow" was "Who framed Roger Rabbit", when i was a kid. Then after that it was "Jurassic Park". That was an amazing movie going experience.
Other extremely memorable and amazing theatre experiences include: "The Rock", "Speed", "The Matrix", "Lord of the Rings - Fellowship of the Ring", "The Dark Knight", "Ace Ventura", and the latest being "Star Wars - The Force Awakens".
Hoping the next one will be "Blade Runner 2049".