Archaeologists in Egypt have discovered the ruins of an ancient fortress dating to the 26th Dynasty, the last dynasty in which native Egyptians ruled before the Persians conquered the country in 525 B.C., according to the Egyptian Ministry of Antiquities. Researchers uncovered parts of the mud-brick stronghold -- including the northeastern and southeastern towers -- at the Tell El-Kedwa site in North Sinai. Previously, in 2008, archaeologists had excavated the military citadel's eastern wall, but the fortress is so large, it took until now to unearth more of its remains... Curiously, the old citadel also has chambers full of sand,...