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A calcite stalagmite in the Paradise Room that has grown to the top of the room's ceiling.
This base of a limestone stalagmite is made from material being dripped from the ceiling onto the formation.
Calcite formations line the walls of the caves at Lewis and Clark Caverns State Park.
An illuminated stairway carved into the limestone leads tourists up to the Paradise Room at Lewis and Clark Caverns State Park.
Per Hogsten and his son Phillip of Lund, Sweden, explore the caves at Lewis and Clark Caverns State Park.
Lewis and Clark Caverns State Park tour guide Pam Schroeder explains to a group of tourists the various features of the Paradise Room, the largest cave in the park.
Tourists make their way through the man-made tunnel which serves as the exit for the caves at Lewis and Clark Caverns State Park. The Civilian Conservation Corps built the 538-foot-long tunnel in the 1930s.
Tourists stand next to one of the large calcite stalagmite formations inside the Paradise Room at Lewis and Clark Caverns State Park. The room is considered to be one the most decorative caves in the northwest United States.
Tourists return from the caves at Lewis and Clark Caverns State Park.
Lewis and Clark Caverns State Park ranger Tom Forwood explains what makes the caverns unique in the Northwest of the United States.
Celebrate the 75th anniversary of Montana State Parks with this collection of stories on our state's prized locations.
Eight-year-old Sam Wandrei looks at a fossil with his father, John Schrager, both of Shoreview, Minn., during a tour through Niagara Cave near Harmony, Minn.
A tour group makes their way through Niagara Cave near Harmony, Minn. The cave is open to tours daily.
Paved floors and new lighting were part of a construction project at Mystery Cave near Preston, Minn., that finished in 1992.
Interpretive naturalist Kery Erickson gives a one-hour tour of Mystery Cave near Preston, Minn.
A column starts to form as a stalactite and stalagmite meet in Mystery Cave near Preston, Minn.