Please Help Me Understand Gold

I graduated in 2000.In the same year I made my first purchase of  gold.Since then I’ve been watching the price of gold.The first thing to attract my attention was the relentless upward movement in the price show in the graph below:                                                                                                                                                                             

Logic suggested that what goes up in price must come down.So I tried looking for the historic prices of gold to try to see if there was a cycle . Read more of this post