Vanished ... An ancient Arabian city is consumed by the desert. A Russian princess escapes burial in her murdered family's mass grave. A British airplane disappears just minutes before its scheduled landing in Santiago, Chile.

Join today's scientists, archeologists and historians as they peer into nine unsolved mysteries from the past.

Read the historical file. Find out who has vanished and the reasons they may have disappeared. Immerse yourself in a different time and place.

Meet the investigators. These determined men and women from around the world showcase an impressive mix of scientific backgrounds. Learn about archeology, anthropology, glaciology, dendrochronology, and more.

Study the tools and techniques important to each case. Researchers use a variety of search methods, some time-tested, others totally innovative. What is revealed when they CAT scan a mummy or tow a sonar device across the Mediterranean seabed?

Armed with the latest technology, can these modern detectives finally declare ... Case Closed?