OLDEST STRUCTURE DISCOVERED IN MEROE, SUDAN

Hidden beneath an ancient palace in what is now central Sudan, archaeologists have discovered the oldest building in the city of Meroë, a structure that also may have housed royalty.

The capital of a vast empire that flourished around 2,000 years ago, Meroë was centered on the Nile River. At its height, the city was controlled by a dynasty of kings who ruled about 900 miles (1,500 kilometers) of territory that stretched from southern Egypt to areas south of modern-day Khartoum.

People of Meroë built palaces and small pyramids, and developed a writing system that scholars still can't fully translate today. Although Meroë has been excavated off and on for more than 150 years, archaeologists are not yet clear on how it came to be. The city seems to have emerged out of nowhere. [Image Gallery: Ancient Rock Art of Sudan]