The Zwentendorf Nuclear Power Plant is the only plant in the world that was built but never operational ...

The Great Pyramid of Giza, towering at 147 meters and holding the record as the tallest man-made structure for nearly 4,000 ...

At Tejon Ranch, California's biggest swath of privately held land, changes are happening due to an activist investor group ...

Ira Block/National Geographic Image Collection From the flat top of the colossal Monks Mound—with a footprint of 14 acres, the mound is larger at its base than the Great Pyramid of Khufu—the ...