Houston is internationally known for its energy—particularly oil—and aeronautics industries, and for its ship channel. The Port of Houston ranks first in the country in international cargo and second in total cargo tonnage. Second only to New York City in Fortune 500 headquarters, Houston is the seat of the Texas Medical Center, which contains the world's largest concentration of research and healthcare institutions. | Houston is internationally known for its energy—particularly oil—and aeronautics industries, and for its ship channel. The Port of Houston ranks first in the country in international cargo and second in total cargo tonnage. Second only to New York City in Fortune 500 headquarters, Houston is the seat of the Texas Medical Center, which contains the world's largest concentration of research and healthcare institutions. |