Travelling to other dimensions becomes it?s usual with this mod, which becomes available for version 1.6.2 and 1.6.4 of Minecraft.
Mystcraft 1.7.2 and 1.6.4 adds basic objects as a series of books that gives us access to new dimensions and learn its features, and then be able to create our own custom dimensions.

Detail and Download here : Mystcraft Mod

Homepage: Mods for Minecraft