Hidden Worlds

Did you know that one hundred years ago Chicago had a miniature underground train system that criss-crossed beneath the streets? Or that Paris has over six million skeletons buried in ancient chambers and tunnels beneath the city? This fascinating book presents 11 stories of incredible tunnels from around the world past and present including, the ancient Greek myth of the Minotaur in the labyrinth; the aqueducts of the ancient Romans; the hidden treasure in the pyramids of Egypt; the great escape of WWII prisoners of war, and much more!