The energy giant behind the plant, Acciona Energia, called in archaeologists who have since uncovered details of a 140,000-square-foot fortress on a hill—which included stone and adobe walls ...

One of D.C.’s newest trophy office buildings now has the city’s biggest green wall. 17xM, a 334,000-square-foot, 11-story building at 1150 M Street, N.W., includes a two-story, 1,500-square-foot, self ...