The Mesabi Range Mines Are Still Visible From Space — The Holes That Fed Pittsburgh's Furnaces

The Lift Slab Floor 16 Stories Pancaked in 5 Seconds and Killed 28 at L'Ambiance Plaza

The Snow Sheds: 37 Miles of Wooden Tunnels Built to Stop Trains Being Buried in the Sierra

The Lumber Dock Massacre: IWW Workers Shot Arriving at Everett's Mill Town, 1916

The Factory That Built the Titanic: 8 Died Building It — 1,500 Died Riding It

The Moffat Tunnel 6 2 Miles Through the Continental Divide and 28 Who Never Came Out

The Threshing Machine Belt: The Farm Machine That Took More Arms Than the Civil War

The Circular Saw Blade: The Single Machine That Killed More Workers Than Any Other

The Abandoned Turnpike Tunnels Are Still Standing in Pennsylvania — 13 Miles of Empty Highway

50-Ton Gold Dredges Are Still Sitting in California's Rivers — Abandoned Where They Stopped

The Berkeley Pit Is Still Filling With Toxic Water in Butte — 342 Geese Landed and All Died

The Cattle Cars: 1,300 Copper Miners Loaded at Gunpoint and Shipped Into the Desert

The Concentrator Mill 1,000 Miners Dynamited Their Own Workplace at Coeur d'Alene

The Night Pittsburgh Burned Railroad Strike That Destroyed 104 Locomotives in 1877

The Corporate Spy: Pinkerton Agent Whose Testimony Hanged 20 Coal Miners

The Cast Iron Lugs Wind That Killed 75 and a Train on the Tay Bridge

The Eyebar Chain: One Crack 0.1 Inches Deep That Killed 46 on the Silver Bridge

136 Men Sealed Under the Irish Sea — The Chalk Messages They Left Behind

The Machines That Built Chicago's Stockyards and Turned Workers Into Meat

The Machines That Built the Hoover Dam Penstocks — And the Men Who Welded Inside Them

The Machines That Built the Washington Monument — and the 23 Years It Sat as a Stump

The Machines That Built the Transcontinental Railroad and the 1,200 Men They Didn't Name

The Asbestos Safety Curtain The Device That Jammed and Killed 602 in Chicago

The Socket Wrench Dropped Tool That Blew Open a Nuclear Missile Silo in Arkansas

The Mont Blanc Cargo Hold 2,925 Tons of Explosives That Killed 2,000 in Halifax

The Italian Hall Staircase False Fire Alarm That Killed 73 Children at a Miners' Christmas Party

The 14 Inch Drill Bit : The Single Tool That Drained an Entire Lake in 3 Hours

The Copper Stamp Mills Are Still Rusting on Lake Superior : The Machines That Wired America

Youngstown's Blast Furnaces Are Still Rotting Black Monday Killed 40,000 Jobs in 3 Years

The Largest Steam Hoist Ever Built Is Still Sitting in Michigan : The Cable Is Still on the Drum

Thousands of Coke Ovens Are Still Lining the Valley That Fueled Carnegie's Furnaces

Sloss Furnaces How Convict Leasing Powered Birmingham’s Iron Empire

Bethlehem Steel: The Arsenal That Built America’s Skyline & Warships

Carnegie's Last Blast Furnaces Are Still Standing Over the Monongahela We Went Inside

The Machine That Built New York's Deepest Tunnels Was Not a Drill. It Was a Refrigerator

The Machines That Built Vanderbilt's Empire and Killed One Brakeman Every Week

The Forgotten Machines That Pulled 2 Million Stumps From the Prairie — By Horse Power

The Mine Fire Under Centralia Has Been Burning Since 1962 — It Won't Stop for 250 Years

The Forgotten Machines That Raised an Entire City 17 Feet — Galveston, 1902

12 Dredges That Built the Panama Canal Are Still in the Jungle — They Were Never Recovered

The Machines That Built Edison's Empire And Electrocuted the Men Who Wired It

How America Built a Railroad Across Open Ocean — and a Hurricane Destroyed It

The Machines That Built Standard Oil's Pipeline And Set Pennsylvania On Fire

It Averaged One Ironworker Dead for Every $1 Million Spent — The Cost of the Skyline

The Forgotten Machines That Moved an Entire Town — Because the Mine Wanted the Ground

How America Built 2,710 Ships in 4 Years and the Welders Who Died Inside the Hulls

The Forgotten Machines That Drilled 1,659 Feet Through Granite — and the Men They Didn't Count

How America Moved 28 Million Tons of Iron Ore and Lost Ships Every Winter Doing It

It Averaged One Railroad Worker Dead Every Hour — The Link and Pin Coupler

The Machines That Built Carnegie's Steel Empire And Turned Pittsburgh Black

The Forgotten Machines That Keep New Orleans From Drowning : They're Still Running

The Boring Machine Failed After 10 Feet : Then...They Spent 24 Years Finishing by Hand

The Deadliest Press Nobody Guarded : The Machine That Took More Hands Than Any Other

The Ventilation Furnace : Fuel Savings That Killed 216, Fraterville 1902

The Searcy Missile Silo Welding Rod : Hydraulic Line Strike That Killed 53 in Arkansas

The DUPONT Powder Press Compression Detonation That Killed 31 on the Brandywine, 1818

The Concrete Dam Wall : Design Failure That Killed 431 in Mulholland's Valley, 1928

The Lap-Joint Boiler : The Hidden Crack That Killed 58 Workers at Brockton

The Deadliest Locomotive That Vaporized Its Crew And Was Returned To Service : The Mallet

The Deadliest Furnace Nobody Feared : The Induction Era