If you are interested in geology and seeing the process of changes on the planet, you will not find a better place than the "Grand Valley" of the state of Arizona in the United States. The deep and narrow valley in which the Colorado River flows and eroded by natural factors, displays colorful and breathtaking layers. The unique flora and fauna of this national park, which is part of the UNESCO world heritage, along with its seasonal waterfalls and volcanic rocks, have attracted the attention of many tourists from all over the world.