The Stewart family continued ownership of the cave until 1955 when Floyd Denton purchased the cave with great plans for development. Unfortunately, his plans were cut short when he died of a stroke in 1961. The present ownership purchased the cave in 1973 during the period when Interstate 64 was being constructed through southern Indiana. With better roads, an increasingly mobile population and aggressive promotion and quality improvements, the cave business began to grow again. The cave and surrounding park have grown nearly continuously during the past 40 years.