Follow the paleontologists who are reconstructing a terrifying carnivore dubbed Spinosaurus.
Uncover secrets of some colorful and deadly early flying machines and explore their role in WWI.
Watch the re-creation of an 18th-century hot air balloon, using period tools and materials.
The 1932 kidnapping and killing of Charles Lindbergh's 20-month-old son is revisited. Investigators employ forensic and behavioral science techniques in an effort to learn what happened to the baby and why.