The St. Louis Arch is the tallest national monument in the United States at 630 feet; it is the city's best known landmark and a popular tourist attraction. Over a million people take the tram up to the top of the Arch however, Carolyn and Jonathan will have to do it another time. I wasn't going to subject the two of them or my two ears to the potentional crying in the small enclosed "egg" shape tram to the top. Many people often ask about the Arch's construction. It began February 12, 1963 and the last section of the Arch was put into place on October 28, 1965.