How a highway runs through a giant hole
It’s History11 Maalis

How a highway runs through a giant hole

Just south of Chicago lies the Thornton Quarry, a limestone excavation that is nearly 500 feet deep and over a mile wide. I-294 runs directly through it, featuring sheer rock walls that plunge hundreds of feet. This site serves as a significant engineering landmark in America, with a history connected to Chicago founder Gurdon Saltonstall Hubbard. The video explores the evolution of limestone mining, the construction of the Tri-State Tollway, and the Deep Tunnel Project, highlighting how the former quarry became essential to Chicago's flood control system, capable of holding billions of gallons of stormwater. Additionally, it covers its geological history, which dates back 440 million years to a tropical sea and includes a meteorite impact. #Chicago #Engineering #History Learn more about your ad choices. Visit megaphone.fm/adchoices

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What’s 1,000 Feet Underground in a Medieval Salt Mine?

What’s 1,000 Feet Underground in a Medieval Salt Mine?

Buried nearly 1,000 feet beneath southern Poland lies the Bochnia Salt Mine, one of Europe's oldest salt mines and a UNESCO World Heritage site with a history spanning nearly 1,000 years. This sprawli...

25 Maalis 28min

Why Seattle’s Floating Highway Sank

Why Seattle’s Floating Highway Sank

On November 25, 1990, a section of the Lacey V. Murrow Floating Bridge in Seattle collapsed and sank into Lake Washington, an event witnessed live by thousands. The bridge, an essential transportation...

24 Maalis 17min

Why Are Secret Towers in the Mississippi River?

Why Are Secret Towers in the Mississippi River?

In the middle of the Mississippi River near St. Louis stand two mysterious stone towers known as the Chain of Rocks intake towers. Built in 1894 and expanded in 1915, these structures were crucial for...

23 Maalis 18min

Why Cheyenne Mountain is Totally Forbidden

Why Cheyenne Mountain is Totally Forbidden

Carved deep into the granite of Colorado’s Front Range lies the Cheyenne Mountain Complex, one of America’s most secretive Cold War creations. Built to survive nuclear war, this underground fortress h...

22 Maalis 19min

What's Below Chicago's Bean? The Lost Railyard

What's Below Chicago's Bean? The Lost Railyard

Beneath Chicago’s Cloud Gate lies the city’s dramatic transformation. This episode traces Grant Park's evolution from marshland and post–Great Fire landfill to a bustling urban landmark, exploring Dan...

21 Maalis 34min

Why Dark Entry Forest is Totally Forbidden

Why Dark Entry Forest is Totally Forbidden

Hidden deep within the forests of Connecticut lies the ruins of Dudleytown, a vanished colonial village that mysteriously disappeared, leaving behind only stone foundations and enduring legends. This ...

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Why This Massive Asylum Was Left to Rot | The Story of Fairfield Hills Hospital

Why This Massive Asylum Was Left to Rot | The Story of Fairfield Hills Hospital

Hidden in Newtown, Connecticut, Fairfield Hills Hospital stands as one of America's eeriest relics of mental health history. This vast psychiatric complex, known for its extensive underground tunnels,...

19 Maalis 20min

What Happened to Chicago’s Lost Lake Bridge?

What Happened to Chicago’s Lost Lake Bridge?

In the mid-1800s, Chicago faced the challenge of battling Lake Michigan's storms that eroded its shoreline. Engineers constructed a bold trestle bridge over the lake, with the Illinois Central’s woode...

18 Maalis 14min

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