"When we go on the interstate above the roads it looks tiny, but when you go into it, the roads are wide and it's bigger than you thought," said young Ella Yost.
The Concrete Materials quarry on west Madison has been producing crushed rock since 1930.
"We're very, very lucky in the Sioux Falls area to have this stone. It helps make everything cheaper. It makes our roads cheaper, our homes cheaper, our sidewalks cheaper," said Siouxland Heritage Museums Curator of Education, Kevin Ganse.
Pavers like those on 6th Street near the Cathedral are also made of local quartzite. Roads all across the country in cities like Detroit, Chicago, and Kansas City also used Sioux Falls quartzite.
For the past ten years, Concrete Materials has been partnering with the Siouxland Heritage Museums to give tours called "Into the Pit". It's an hour of education for all ages.
"(We learned) what they use it all for. They recycle it all. Nothing goes to waste. They use everything," said Flyn Yost on the quarry tour.
"I would highly recommend this to anybody who's interested in the earth and materials and the history of Sioux Falls," added Helen Short. "And, the natural products we have from our good mother earth."
Tours are free, but reservations are required. Call 367-4210 ext. 0 to secure your spot.