The Texas Medical Center is larger than most cities. It is a city within a city. Wikipedia says  it has…

 54 medicine-related institutions, including 21 hospitals and eight specialty institutions, eight academic and research institutions, three medical schools, six nursing schools, and schools of dentistry, public health, pharmacy, and other health-related practices. All 54 institutions are not-for-profit. The center exceeds one thousand acres (or 1.562 square mile).

During the day, these streets are extremely busy. Late at night, things may get very quiet outside, but indoors, people continue to work around the clock. This small slice is the intersection of Dryden and Fannin, looking up at the Baylor College of Medicine Faculty Center and St. Luke’s Medical Towers.