Ways to Travel through Parallel Universes or through Time

photo: The One Ring--an actual 10k gold ring, with box, at  http://www.myprecious.us/jewelry/noble_collection_one_ring.php

Holes in the ground/Drugs (Alice in Wonderland)
Potion (The Talisman)
Government Program/Technology (Time and Again)
Scientist/Technology (The Time Machine; Back to the Future)
A Ring/Spells/Wizardry (The Lord of the Rings and Harry Potter)
ESP (The Dead Zone)
Dreams/Sleeping (The Wizard of Oz; Rip Van Winkle, and too many others to mention)
Going Deep Underwater/Going Deep into the Earth/Going to another Planet (Too many to mention)
Circling the Sun in a Fast Spaceship (Star Trek IV)
Traveling with, or being in the Presence of, Ghosts (A Christmas Carol; Field of Dreams, and others)
Simple Doorways to another Place/Time (11/22/63; The Lion, the Witch and the Wardrobe; A Wrinkle in Time)
Mirrors (too many to mention)
Books/Reading (The NeverEnding Story)
Movies (Early Woody Allen flicks)
Utterings (too many to mention)
Insanity/Fanciful Desire (too many to mention)
Writing (Lisey's Story; The Dark Half)
Being Immortal/Memories of Someone Eternal (Highlander; Dracula; many others)
Death/Dying/Falling (The Dark Tower series; Twilight Zone: The Movie; many others)

Can anyone think of any others?  I need the way and I need the source.  Your own ideas are welcome.  Right now, I'm thinking of a guy who, whatever he touches, he leaves a sort of trail, so that people throughout the years can follow that trail, or be drawn to it (or to him), by touching the things he did.  Just a thought.  That's kinda like The Dead Zone, but not quite, not the way I'm seein' it.  Discuss.