The Tower of the Americas was designed by O’Neil Ford and built for the theme structure of 1968 World’s Fair in San Antonio. It is 750 ft tall and acts as an observation tower as well as having a revolving restaurant at the top. The tower is constructed out of slip-formed reinforced concrete . The top of the tower was built on the ground and then set on top of the tower once it was constructed. It is the tallest structure in San Antonio. It is an active tourist stop for the city.