Niagara Falls.

The fall was originally located at the edge of the Niagara Escarpment, along the lake Ontario. As the ice from Wisconsin glaciation melted, the upper Great lake emptied its water into the lower Great lake, through the Niagara river. In the past 12,000 years, the fall has been receding towards the Lake Erie to reach where it is now; eroding the cuesta inch by inch. In the far future it is expected that the Niagara fall will reach the edge of lake Erie and cause an immediate drainage that can over flow the lake Ontario.

learning geology can make one understand and survey the natural landscape, 

and give knowledge to say more than just "it's beautiful" or "it's huge"