Sen. Mitch McConnell and Rep. Brett Guthrie both filed the Mammoth Cave National Park Boundary Adjustment Act on Thursday.

Kentucky’s most well-known national park could be getting bigger, as U.S. Senator Mitch McConnell, R-Louisville, and U.S.

Mammoth Cave National park may soon see a major expansion after two prominent Kentucky lawmakers introduced a new bill.

Sen. Mitch McConnell and Rep. Brett Guthrie introduced the "Mammoth Cave National Park Boundary Adjustment Act" in Congress.

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.

A major expansion could be coming to Mammoth Cave National Park, as lawmakers are pushing a bill to add more land to the ...