Mr. Lambert decided to develop both the Lookout Mountain Cave and the new found Ruby Falls Cave to the public and offered tours to both caves. The entrance building for both tours was built from the limestone excavated from the elevator shaft and the cave trails. This entrance was touted as the “Worlds Most Magnificent Cave Entrance”. “Cavern Castle”, as it was named, was modeled after a fifteenth century Irish castle.

From 1930 to 1935, tours were offered to both caves, but Ruby Falls proved to be the most popular with its many unusual formations and of course the waterfall itself. In 1935 the Lookout Mountain cave was closed to the public. The Ruby Falls Cave has been open to the public ever since and has hosted millions of visitors during its long storied history.