While many know that ferocious dinosaurs and large mammals once roamed America, very few realize that prehistoric creatures once stalked the exact sites where we've built major cities and the most famous landmarks. Prehistoric takes you back in time to see what stood, lived, fought and died in backyards hundreds, thousands, even millions of years ago. Beginning with the lost worlds of New York City, Prehistoric explores the amazing extinct creatures that once called modern cities their home. Merging modern day architecture with a unique cast of bizarre extinct creatures, explore the action across that took place across New York Ep; Chicago; Washington DC; Denver; Dallas and Los Angeles.