This is where the story begins and ends. Here is where the Ring was created, and where it must be destroyed. Sauron created The One Ring to become all powerful. He rose an army of orcs and tried to storm the land, but Isildur, the king of man at the time, when he cut the Ring off of Sauron, destroying him, he became addicted and weak to its power. Then eventually, after many masters, the Ring came to Bilbo. Bilbo gave it to Frodo who then journeys to Mordor, the dark land of all evil. There he casts the Ring into the fires of Mount Doom. The only place it could be destroyed.
I did not know all of this, so please check out my references.