Happy Independence Week, DC! America turns 249 this weekend. You can celebrate the holiday with fireworks, barbecue fare, and ...

Civilizations from Stone Age Scotland to the eighth-century Maya to 13th-century African empires have used dry stone walling ...

The Giza Plateau, home to the Great Pyramids and Sphinx, continues to fuel debate about how ancient Egyptians achieved such remarkable precision. From granite boxes with tight tolerances to massive ...