From the Great Pyramid at Giza to the towering skyscrapers of today, humans have engineered massive constructions for at least 5,000 years. But why? How do biology and human emotions affect our desire to build gigantic structures? Why were the earliest mega-structures almost always pyramids? Why do people have the urge to build tall, and how do mega-structures on earth echo a basic principle embedded in the very structure of the universe?
Off-grid settlers Jim, Nancy and John face being stranded without basic necessities when an avalanche hits and blocks the track. Roadmaster Hugh Evans battles freezing temperatures to get propane to the off-gridders before they literally freeze to death.
Flight takes more than wings. We need the right kind of air, the perfect materials cooked up over billions of years, and cosmic forces that are just right for us to leave the ground without tumbling off into space. Big History reveals how planet Earth is the perfect planet for flight.
Singer Kim Carnes returns to a farmhouse in Franklin, Tenn., where she once met a childlike spirit.
Lockup explore prison facilities throughout the United States, profiling notable inmates, incidents, and prison operations.
David Reyne visits Darwin and the amazing Litchfield National Park, and Scotty takes the road less travelled on an ATV tour of Phuket, before a bit of go-karting on Queenland’s Sunshine Coast.
Someone from Bingrae's family finds out about him dropping out of school.
The Hoffman crew attempts to set up their washplant, but the jungle fights them every step of the way. The Dakota Boys find their first bedrock gold in the glory hole. In the Klondike, Parker gets more gold out of Little Blue than the Hoffmans ever did.
Grayson tries to win Lady Jayne's heart; Lucy hides her broken heart behind planning Mina and Harker's engagement party; Grayson's reunion with an old friend complicates matters; Van Helsing suffers a setback.
Carrie pitches Larissa a profile on New York wunderkind playwright Adam Weaver, but when he proves a difficult, yet fascinating, interview, Carrie’s job is on the line. Bennet’s rules in his relationship with Walt force Walt to acknowledge his real feelings. Carrie and Dorrit are surprised to find a common enemy in Tom’s girlfriend Deb’s son Dylan. Meanwhile, Sebastian seeks comfort in the arms of someone new.
Steve and Amy disclose new information about previous investigations of paranormal activity at family homes in Flint, MI, and Fort Wayne, IN, featuring shocking, never-before-seen footage of a violent exorcism.
Funnyman Tracy Morgan was so impressed by his ATM shark tank that he’s coming back for round two! This time, it’s a new home for his beloved octopus. To get this tank installed on time, Brett and Wayde will have to move in with Tracy for a few days!
Vanessa feels guilty after encouraging Mandy to end things with Kyle, so she decides to try to make things right.
Frank is put in danger when his dinner companion, mob lawyer Angelo Gallo, is shot. Danny is a juror in a murder trial.
When Phineas and Ferb discover a commemorative coin from the 1903 Danville World’s Fair, Lawrence recounts the events of the festival to them, in which steam-driven devices were introduced and a set of kids, who were very much like them, were preparing for the highly anticipated event.
Debbie wants to enroll in business school but first must pass a qualifying exam; Reggie and Amber's relationship is tested.
Korra and company attempt to close the spirit portals before Harmonic Convergence.