Visitors make their way down 280 stairs as they descend a large vertical shaft at the start of the Domes and Dripstones tour of Mammoth Cave at Mammoth Cave National Park.
Visitors make their way down 280 stairs as they descend a large vertical shaft at the start of the Domes and Dripstones tour of Mammoth Cave at Mammoth Cave National Park. Jeffrey P. Mayor Staff writer
Visitors make their way down 280 stairs as they descend a large vertical shaft at the start of the Domes and Dripstones tour of Mammoth Cave at Mammoth Cave National Park. Jeffrey P. Mayor Staff writer

Mammoth Cave filled with geologic wonders

August 14, 2015 10:00 PM

UPDATED August 15, 2015 05:00 AM

More Videos

  • What you need to know about August's solar eclipse

    The U.S. is in for a rare astronomical treat on August 21, 2017 — that's the day of the "Great American Eclipse." It's the first total solar eclipse to cross the entire U.S. in 99 years, and more than 12 million Americans live in its path.