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- Season 1 1993-12-10
- Season 2 1994-12-16
- Season 3 1995-08-20
- Season 4 1996-09-02
- Season 5 1997-08-17
- Season 6 1998-07-27
- Season 7 2000-01-03
- Season 8 2001-01-08
- Season 9 2002-01-02
- Season 10 2003-01-01
- Season 11 2004-01-16
- Season 12 2005-01-05
- Season 13 2006-01-04
- Season 14 2007-01-17
- Season 15 2008-01-07
- Season 16 2010-01-14
- Season 17 2010-10-29
- Season 18 2011-10-03
- Season 19 2013-07-16
- Season 20 2021-02-20
- Season 21 2021-07-25
- Season 22 2021-11-28
- Season 23 2022-02-16
Season 23 Episode
- Season 12 Poison
- Season 12 Car Tech of the Future
- Season 12 The Arch
- Season 12 More Nature's Engineers
- Season 12 World's Biggest Machines 3
- Season 12 Blackbird Stealth
- Season 12 The Butcher
- Season 12 George Washington Carver Tech
- Season 12 Firefighting!: Extreme Conditions
- Season 12 Desert Tech
- Season 12 Sub Zero
- Season 12 The Great Bridge: 8 Miles of Steel
- Season 12 Howard Hughes Tech
- Season 12 Edwards Air Force Base
- Season 12 Taxidermy
- Season 12 SWAT
- Season 12 Deadliest Weapons
- Season 12 The Doomsday Clock
- Season 12 The Basement
- Season 12 Paint
- Season 12 Mega Movers
- Season 12 Punishment
- Season 12 Bricks
- Season 12 Glue
- Season 12 F/A-22 Raptor
- Season 12 Civil War Tech
- Season 12 Machines of D-Day
- Season 12 John Hancock Center
- Season 12 The Cape Cod Canal
- Season 12 Secret Japanese Aircraft of World War II
- Season 12 Future Tech
- Season 12 Edison Tech
- Season 12 Secrets of Soviet Space Disasters
- Season 12 Mountain Roads
- Season 12 Route 66
- Season 12 Cowboy Tech
- Season 12 Sewers
- Season 12 Challenger Tank
- Season 12 World's Biggest Machines 4
- Season 12 Dredging
- Season 12 Lube Job
- Season 12 Secret Luftwaffe Aircraft of World War II
- Season 12 The World's Fastest
- Season 12 The B-2 Stealth Bomber
- Season 12 High Risk: Helicopter Lineman
- Season 12 Wiring America
- Season 12 Nature Tech: Lightning
- Season 12 HMS Victory
- Season 12 Engineering an Empire: Rome
- Season 12 Coffee
- Season 12 Sugar
- Season 12 Cereal: History in a Bowl
- Season 12 F-117 Nighthawk Stealth
- Season 12 German Small Arms of World War II
- Season 12 The Auto Store
- Season 12 Secret Allied Aircraft of World War II
- Season 12 Engineering Disasters 17
- Season 12 Brewing
- Season 12 The Lumberyard
- Season 12 Da Vinci Tech
- Season 12 Custom Cars
- Season 12 More Hardware
- Season 12 Weird Weapons: The Allies
- Season 12 More Snack Food Tech
- Season 12 Walt Disney World
- Season 12 Nature Tech: Hurricanes
- Season 12 Private Collections
Modern Marvels - Season 12 Episode 28 John Hancock Center
7.90 44 minutes A steel giant standing 1,107 feet high on broad shoulders, this vertical city houses 1,200 people. Join us as we explore how a young architectural team from Skidmore, Owings & Merrill conceived of an innovative 100-story, multi-use tower. A construction crisis halted the project for six months, but once it resumed, it took just four years and 50 million man-hours to complete the John Hancock Center. In the heart of Chicago, the John Hancock Center rises 100 stories above the luxury shops and restaurants that line the famous Magnificent Mile. It opened on May 5, 1970 with 237,657 square feet of retailing, 812,160 square feet of offices, 703 rental apartments (converted to condominiums in 1974), 507-car parking garage, and an ice skating rink! There are 1,250 miles of wiring and 11,459 panes of glass. Nicknamed “Big John”, it cost $100-million and took 46,000 tons of steel to build.
