Best known as the hometown and burial location of President Warren G. Harding and First Lady Florence Harding, Marion was one of Ohio's major industrial centers until the 1970s. Products of the Marion Steam Shovel Company (later Marion Power Shovel) built the Panama Canal and in the 1960s, NASA contracted with Power Shovel to construct the crawler-transporters that moved the assembled Saturn V rockets, used by Project Apollo, to the launch pad. In 1911, 80% of the nation's steam shovel and heavy duty earth moving equipment was manufactured in Marion, Ohio. Marion is a city in the U.S. state of Ohio and the county seat of Marion County. The municipality is located in north-central Ohio, approximately 50 miles (80km) north of Columbus.