Best Movies where the Hero enters an Alternate Realm or Dream?

[Zivouhr]

What are some of the Best Movies where the Hero enters an Alternate Realm, Dimension or Dream?

Watching Inception, where they enter the dreams of others as agents, I'm reminded of Tron, The Matrix, Dreamscape, Twin Peaks, Total Recall, Nightmare on Elm Street. Hellraiser was also good for this Fantasy Realm subgenre.

Speaking of dreams, do you remember most or some of your dreams after waking up? Unless I write them down right away, most times I forget within seconds of waking.

List some favorite Dream/Dimension type films:

The Matrix
Tron Legacy, Tron
Twin Peaks (Film-like series 1, 2 & 3 seasons)
Dr. Strange, Dr. Strange 2
Total Recall (Reboot), Total Recall
Dreamscape
Inception
Hellraiser

I guess the Marvel Multiverse films could qualify, as the heroes enter other dimensions.