Genre: Documentary, History, Science
Premise: A camera crew descends hundreds of feet below the streets of major cities -- such as New York, Cairo, London and Tokyo -- to explore the layered remnants of civilizations left buried deep under modern metropolitan centers.
S01, E03 (First Aired: Apr. 30, 2007)
Exploring Nazi Germany's World War II bunkers beneath the streets of Berlin.
S02, E05 (First Aired: Mar. 3, 2008)
Prague, Czech Republic: quarries in which Adolf Hitler may have stored his most powerful secret weapon; mines that doubled as Communist slave camps.