Sign marking the original natural entrance to Marengo Cave.
The sinkhole that led to the discovery of Marengo Cave. It's long since been covered up.
This is a cave column. A column happens when a stalactite (ceiling) and stalagmite (ground) grow together.
Marengo Cave has a few of these holes that ground water drips through.
This is a cistern that cave tour operators put in Marengo Cave over 75 years ago. It's still there, and has become coated with minerals.
Stalactites growing from the ceiling in Marengo Cave.
Stalactites in Marengo Cave.
Rimstone dams in Marengo Cave. And no, those aren't naturally occurring bricks and paths on the right. ;-)
This is a small underground river that leads deeper into Marengo Cave.
Occasionally pieces of the cave ceiling will break off, like this one. This happened so long ago, that stalagmites grew on top of it (a stalagmite grows 1" for every 10 years. So how long ago must this one have fallen?)
This is a hole in the ceiling where groundwater drips in to Marengo Cave.
That blue light in the back is near the original entrance to Marengo Cave. The entrance has long since been closed up.
This is a piece of handrail that tour operators installed when the cave first opened up for tours in 1883. See the previous photo for the old entrance.
One of the gorgeous rooms in Marengo Cave. I love all the colors here.
This is hundreds of thousands of years worth of buildup from mineral-rich water dripping slowly into the cave.
Beautiful dripstone in Marengo cave. This is one of my favorite photos.
Soda straws that will one day turn into stalactites - Marengo Cave, Indiana
Some examples of flowstone.
This is flowstone. It looks a lot like bacon.
This is the Crystal Palace. That yellow & blue light is from a projector they use to show a short movie about the cave's history. I love that formation right above the light.
This is the formation on the back wall of the Crystal Palace.
Another dripstone formation.
This is an example of a rimstone dam in Marengo Cave.