Indiana Dunes National Lakeshore park rangers have begun leading tours of a dune that was closed to the public two years ago.
The limited access tours of Mt. Baldy are the first for the park since a sinkhole trapped a 6-year-old Illinois boy for more than three hours in 2013.
The boy miraculously survived.
Park Ranger Bruce Rowe says the trail has been cleared by a team of scientists that have been have been mapping the openings, depressions and anomalous features of the dunes.