This formation was
found inside Jewel Cave National Monument in the Black Hills of South
Dakota.
Stalactites, stalagmites, and other formations abound inside Jewel Cave.
This photo was taken inside Wind Cave National Park in the Black Hills
of South Dakota.
Only about 40 miles separate the Wind Cave and
Jewel Cave systems.
However, it is unlikely that they are connected because they
are so geologically different.