less than 1 minute read

Jewel Cave National Monument

Jewel Cave National Monument, national monument in western South Dakota that preserves an extensive complex of interconnected limestone caverns in the Black Hills and contains one of the longest underground cave systems in the U.S. Jewel Cave was set aside as a national monument in 1908.

Additional topics

21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Jasmine to K