In the middle of the woods, surrounded by moss-covered tree roots, a metal grate sits melded into the earth. It’s not very big — maybe a couple of feet wide. Peer through the door’s bars and you see very little: jagged rocks encircling a passage; beyond that, darkness.
But through the darkness, a fascinating geological wonder exists: Sullivan Cave. The nearly 10-mile cave, located about 25 miles south of Bloomington, Indiana, features long, tight paths, massive rooms and creatures you won’t find on the surface.
This isn’t a commercial
