Hey guys I just found this online and I'm going to share this with you. It's pretty cool, but don't make it in the world you usually play on, it deleted my castles!!!

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1. Create a new world (superflat recomennded but don't matter.)
2. Use obsidian blocks and put 4 next to eachother and stack the 2 on the end 5 blocks high, and fill in the top across, confusing right?
3. Use flint and steel inside the portal on the 2 bottom blocks and it should be a purple vortex. Step inside for few seconds and you will teleport to the Nether.
I know this was confusing but I'll make a video...
~Range~