If you can manage to sneak into the Doctor Who Tardis Necklace you may be able to use it as a means of travel through the great and ever expanding temporal nature of reality! Again...you just need to figure out how to get inside this thing! Once you get bored of trying to figure it out you can just use the Doctor Who Tardis Necklace as a fine piece of jewelry. Oh, and if you do manage to travel through time go say hello to Tesla for me!