The most famous attraction in St. Louis, the landmark building, the Arch is 600 feet high, 192 meters, and can be seen from a distance. You can feel the science and grandeur of the building when you get close. It is said that it cost more than 2 billion US dollars. You can take a cable car to the top and overlook the city in the direction of the old courthouse. You can take the north side bridge to cross the Mississippi River, which is Illinois. You can see the Arch from the bridge or a platform opposite.