Long Forgotten Tracks - S1.E4

Some discoveries lie in wait for those brave enough to venture out. From hidden cities in the jungle to dinosaur fossils and seeds in far-flung locales, the prize goes to those willing to take the risk. The world watches with bated breath as adventurer Percy Fawcett enters the Green Hell of the Amazon jungle. Does he find a lost city in this dangerous expanse? And at a time when America sees a great expansion, two of America's first paleontologists go to war over dinosaur fossils. How far will O.C. Marsh and Edward Drinker Cope be willing to go in their brawl over prehistoric beasts? Confronted by famine, Russia sends a botanist to find the seeds to save an empire. But as political winds shift, Nikolai Vavilov becomes champion for science. How does he fight for the truth when no one else will?