View from "Bridge of Sighs."
View from "Bridge of Sighs."
Entrance to "Long Route."
Entrance to "Rocky Hall."
Wandering Willie's Spring.
Wandering Willie's Spring.
Wandering Willie's Spring.
Path leading to the mouth of cave.
Burt's Cave, near Maquoketa River, Jackson County, Iowa.
Burt's Cave, near Maquoketa River, Jackson County, Iowa.
The organ, Manitou Grand Caverns.