The cave offers two walking tours, gemstone mining, a maze crawl, gift shop, walking trails and picnic grounds.
"Discovered September 6, 1883 by Blanche & Orris Hiestand who descended into the first room. The following Sunday, Mitch Stewart and friends explored the main passageways. The next day, local residents descended in mass on the cave. Owner Samuel Stewart, recognizing the commercial potential, secured the entrance and immediately opened the cave to the public. The Marengo Cave Company was formed in 1900 to operate the cave. The cave became a popular destination for railroad excursions prior to the Great Depression.
"Local residents used their wagons to haul visitors to and from the train depot. As transportation changed from trains to automobiles, the business languished yet survived on word-of-mouth advertising. The cave was sold to Floyd Denton in 1955. Floyd had big plans for redevelopment but died in 1960 before he could realize many of his plans. The cave was sold to a group of avid cave explorers in 1973. Designated a National Natural Landmark in 1984, the cave business has steadily increased since 1973 to become Indiana's #1 natural attraction."
From the cast marker in the parking lot.