What is the two-word name for the 630-foot high stainless steel structure built in the early 1960's in along the banks of the Mississippi River in St. Louis?

St. Louis is home to one of America's most recognizable monuments, a soaring parabolic arch that defines its skyline. This iconic structure, known as the Gateway Arch, stands an impressive 630 feet tall on the banks of the Mississippi River. Its distinctive polished stainless steel skin gleams in the sunlight, a testament to its mid-20th century construction. Built between 1963 and 1965, though not officially dedicated until 1967, it quickly became a symbol of the city and the nation.

The Arch was conceived as a monument to the westward expansion of the United States, commemorating the role of St. Louis as the "Gateway to the West." Its sleek, minimalist design was the brainchild of Finnish-American architect Eero Saarinen, who won a national competition in 1947. Saarinen envisioned a timeless structure that would evoke both the pioneering spirit and the monumental scale of the American landscape. The innovative construction method involved building both legs simultaneously and connecting them at the top.

Today, the Gateway Arch is part of a National Park and remains a major tourist attraction. Visitors can ascend to an observation deck at its apex via a unique tram system, offering breathtaking panoramic views of St. Louis, the Mississippi River, and the Illinois plains beyond. More than just a striking piece of architecture, it serves as a powerful reminder of American history and ingenuity, standing tall as a beacon of exploration and progress.