The economy of the nation's fourth most populous city has a broad industrial base in energy, manufacturing, aeronautics and transportation. Only New York City is home to more large public companies than Houston. The city is also home of the Texas Medical Center, the world's largest concentration of health care and research institutions, and NASA's Johnson Space Center, where the Mission Control Center is located. The Port of Houston ranks first in the U.S. in international waterborne tonnage handled and second in total cargo tonnage handled. Houston has many cultural institutions and exhibits, which attract more than 7�million visitors a year to the Houston Museum District.
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