An energy-harvesting building structure comprising: a plurality of levels; a central vortex tower passing each of the plurality of levels and configured to direct moving air received from the plurality of levels upward toward an outlet at a top of the building structure; at least one wind powered turbine (4,5) located in the central vortex tower for harvesting energy from wind; a plurality of horizontally oriented wind intakes each disposed within a different respective one of the plurality of levels, each horizontally oriented wind intake exposed to an incident wind via wind inlets facing an exterior of the building structure in a plurality of different directions; characterized in that in each horizontally oriented wind intake, a plurality of movable wind vanes (1,2) are provided, each pivotably mounted on a respective vertical pivot axis, whereby the movable wind vanes each have a limited swing range and configured, depending on exposure to the incident wind, to pivot, by force of the incident wind, into a corresponding position at an end of the limited swing range thereof for redirecting the incident wind to spiral inward toward the central vortex tower; and whereby in at least one of the horizontally oriented wind intakes, a respective wind twister (3A, 3B, 3C) is located radially inward of the plurality of movable wind vanes (1,2) and defines a plurality of fixed air directing surfaces configured to receive and redirect the incident wind from the movable wind vanes, so that the incident wind continues to spiral inward and is directed upward into the central vortex tower to feed a circular upward air vortex in the central vortex tower for driving the at least one wind powered turbine. a plurality of levels; a central vortex tower passing each of the plurality of levels and configured to direct moving air received from the plurality of levels upward toward an outlet at a top of the building structure; at least one wind powered turbine (4,5) located in the central vortex tower for harvesting energy from wind; a plurality of horizontally oriented wind intakes each disposed within a different respective one of the plurality of levels, each horizontally oriented wind intake exposed to an incident wind via wind inlets facing an exterior of the building structure in a plurality of different directions; characterized in that in each horizontally oriented wind intake, a plurality of movable wind vanes (1,2) are provided, each pivotably mounted on a respective vertical pivot axis, whereby the movable wind vanes each have a limited swing range and configured, depending on exposure to the incident wind, to pivot, by force of the incident wind, into a corresponding position at an end of the limited swing range thereof for redirecting the incident wind to spiral inward toward the central vortex tower; and whereby in at least one of the horizontally oriented wind intakes, a respective wind twister (3A, 3B, 3C) is located radially inward of the plurality of movable wind vanes (1,2) and defines a plurality of fixed air directing surfaces configured to receive and redirect the incident wind from the movable wind vanes, so that the incident wind continues to spiral inward and is directed upward into the central vortex tower to feed a circular upward air vortex in the central vortex tower for driving the at least one wind powered turbine.