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  2. Illinois Caverns State Natural Area - Wikipedia

    en.wikipedia.org/wiki/Illinois_Caverns_State...

    It features Illinois Caverns which is alternatively known as Mammoth Cave of Illinois (also Burksville Cave, Egyptian Cave, Eckert Cave). Illinois Caverns is the second-largest cave in Illinois and has more than 9.6 km of passages. [1] The cave has a constant temperature of 58 °F (14 °C), and portions flood during wet weather. Passages can be ...

  3. List of archaeological sites on the National Register of ...

    en.wikipedia.org/wiki/List_of_archaeological...

    This is a list of archaeological sites on the National Register of Historic Places in Illinois. Historic sites in the United States qualify to be listed on the National Register of Historic Places by passing one or more of four different criteria; Criterion D permits the inclusion of proven and potential archaeological sites . [ 1 ]

  4. National Register of Historic Places listings in Illinois

    en.wikipedia.org/wiki/National_Register_of...

    Lincoln Courthouse Square Historic District, Logan County East Dubuque School, Jo Daviess County Cave-In-Rock, Hardin County Illinois State Capitol, Sangamon County Dennis Otte Round Barn, Stephenson County Ronald Reagan Boyhood Home, Lee County Pere Marquette Hotel, Peoria County General Dean Suspension Bridge, Clinton County

  5. Illinois Caverns — a ‘hidden gem in southwest Illinois ...

    www.aol.com/news/illinois-caverns-hidden-gem...

    About 150,000 years ago, the area that is now known as Monroe County in southwest Illinois was covered in ice hundreds of feet thick. When the ice melted, the water flowed into fractures in the ...

  6. Illinois Salines - Wikipedia

    en.wikipedia.org/wiki/Illinois_Salines

    The Illinois Salines, also known as the Saline Springs or Great Salt Springs, is a salt spring site located along the Saline River in Gallatin County, Illinois. The site was a source of salt for Illinois' prehistoric settlers and is now an archaeological site with a large quantity of organic remains. After European settlement of Illinois, the ...

  7. Frankfort, Illinois - Wikipedia

    en.wikipedia.org/wiki/Frankfort,_Illinois

    Frankfort is a village in Will County and Cook County in the U.S. state of Illinois. It is a southern suburb of Chicago , and is approximately 28 miles (45 km) south of the city. As of the 2020 census , the population was 20,296.

  8. West Frankfort, Illinois - Wikipedia

    en.wikipedia.org/wiki/West_Frankfort,_Illinois

    West Frankfort is home to the Frankfort Area Historical Museum, which operates in a renovated 3 story Logan Grade School. The Society features a large research library, and maintains a microfilm of U.S. Census and local newspapers. West Frankfort was formerly home to the Daily American Newspaper, which operated for nearly 100 years.

  9. Salt Fork Vermilion River - Wikipedia

    en.wikipedia.org/wiki/Salt_Fork_Vermilion_River

    Saline Branch of the Salt Fork in Crystal Lake Park in Urbana. The Salt Fork is a tributary of the Vermilion River located in the Central Corn Belt Plains of Illinois. [1]The Salt Fork owes its name to saline springs that provided natural salt licks for animals, and which were used for production of salt by Native Americans and early settlers.