Photo of the Day: Inside the Louisville Mega Cavern

IMGL7093meg1200 Riders get ready for a day of riding in the Louisville Mega Cavern in Louisville, Kentucky. There was about half a foot of snow outside the cavern on the day we shot this last winter. No matter what it’s like outside, though, the owners say the Mega Cavern has a constant temperature of about 60 degrees Fahrenheit, all year round. Photo: John Ker/Mountain Bike Action

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