Thornton Quarry
One of the biggest aggregate quarries in the world, Thornton Quarry is situated in Thornton, Illinois, just south of Chicago. The quarry’s deepest point is 450 feet below the surface and it is 1.5 miles long and 0.5 miles broad. Since 1928, Gallagher Asphalt Corporation has operated on the quarry’s property. Tri-State Tollway, Interstate 294, […]