Roger W. Brucker is an American cave explorer and author of books about caves. He is most closely associated with Mammoth Cave in Kentucky, the world's longest cave, which he has been exploring and writing about since 1954.

Mammoth Cave National Park is a national park in south-central Kentucky, US. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,830 acres (21,380 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties. The Green River runs through the park, with a tributary called the Nolin River feeding into the Green just inside the park.