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In ancient times, the tattooed, painted-blue Celts were Europe's most feared warriors. They were also brilliant artists, farmers and metal workers. We'll piece together this puzzling paradox of blood and beauty.

Here in Denver, 65 million years ago, Tyrannosaurus Rex fought Triceratops in a battle to the death, and the Terminator Pig savaged anything in its path.

Ten thousand years ago, it was home to both mammoths and mastodons... 420 million years ago, it was drowned beneath an ancient sea. But where did all Chicago's dinosaurs go?

Mammoths once trampled down Fifth Avenue, sea scorpions were part of the prehistoric freak show on Coney Island, and some of the world's first dinosaurs roamed where the Giants now play.

Sabertooth cats once prowled LA just blocks away from the Oscar's Red Carpet. Duckbilled dinosaurs basked in California's famous surf-until they were attacked by fast and agile super predators. And underneath it all, the ground moved...

Prehistoric Washington D.C. was full of dinosaurs, and flying reptiles with 30-foot wingspans terrorized the skies over the National Mall. That was before it was Ground Zero, site of an asteroid impact that wiped out all life...

Even millions of years ago, it was always Bigger in Texas. Scimitar toothed cats, the largest ocean going reptile ever to exist, and armadillos as big as a car... in Prehistoric Dallas.