A former mill complex in Houston marked as a national historic landmark has an unassuming exterior. The gray-tan brick façade blends with clouds on dreary days, making the complex easy to miss behind new shops and townhouses dotting the property’s perimeter. From some angles, the industrial-style building blocks views of the site's crown landmark: A 100-year-old, five-story clock tower that serves as a reminder of the area's roots as one of the neighborhood's first industrial structures.