The Arch Over St. Louis
The Gateway Arch is located in St. Louis, a major city in the U.S. state of Missouri. The arch rises on the west bank of the Mississippi River and has become the unmistakable symbol of the city, visible across the St. Louis skyline.
A Monument to Westward Expansion
The Gateway Arch was built to honour a key chapter of American history: the great westward expansion of the United States. St. Louis earned the nickname "Gateway to the West" because, in the era of pioneers, it was a key starting point for settlers and explorers heading into the western frontier. The soaring arch stands as a memorial to that pioneering spirit.
A Record-Setting Shape
The Gateway Arch is a remarkable piece of engineering. Standing 630 feet tall, it is the tallest arch in the world. It is built of gleaming stainless steel in a graceful curved shape, and its width at the base is exactly equal to its height. Visitors can even travel up inside the hollow arch in a special tram system to reach a viewing area at the very top.
Source
This article was written using information from Wikipedia.