Houston, TX

Houston, America's fourth-largest city, sits on the flat Texas Gulf Coast about 50 miles inland from the Gulf of Mexico. Major interstates include I-45 to Dallas, I-10 connecting San Antonio and New Orleans, and I-69 heading north. The Sam Houston Tollway circles the metro area for bypass traffic. Local driving centers on Loop 610 and multiple freeways radiating from downtown. Hobby Airport is 7 miles southeast of downtown, while Bush Intercontinental sits 23 miles north. The city houses the world's largest medical center, employing over 120,000 people across 21 square blocks.