The Cathedral Basilica of Saint Louis is one of the largest collection of mosaic in the world. The mosaic art was created by 20 different artists and covers 83,000 square feet (7700 sq. meters). The installation containing 41.5 million pieces of glass tessare employing 7,000 colors began in 1912 and was completed in 1988. Due to its beauty and historical significance, Pope John Paul II designated the Cathedral of Saint Louis a Basilica in 1997.
St. Louis has always attracted tourists and is known across the country because of the presence of the Gateway Arch. Yes, you can take the elevator and go to the top of the arch and look at the beauty of the city, but for me that beauty pales against the beauty that is found within the walls of this Cathedral.