Hajji Hollow was donated to Central Indiana Land Trust by Dr. Rainer Zangerl and his sons Carl and Art. Dr. Zangerl was a paleontologist who wanted to protect this rugged 65-acre forest that he and his wife had come to
know and love. They named it Hajji Hollow due to its location near the small town of Mecca in Parke County. A "Hajj" is a person who makes a mecca or pilgrimage, which the Zangerls made to Hajji Hollow over the years.
Hajji Hollow is an upland forest with beech, tulip, sugar maple, oak, and hickory trees. The forest, which has mostly been undisturbed, contains firepink, Virginia bluebells, trillium, tiger lillies, wood poppies, and phlox. Sycamores are common along the small creek that runs through the property.