
Adventure writer Cary Griffith recounts riveting and life-threatening tales of exploration in the limestone caves of southwestern Minnesota and the man-made caves of St. Paul.

Narrow passages, twisting upward or dropping precipitously. Huge vaults filled with fantastic shapes. Tunnels twined in tangled mazes. Over centuries, underground rivers can carve holes and rooms in solid rock; drips of water build walls of stone. Natural caves shape another...