Forbidden Caverns is a set of caverns and tourist attraction in Sevierville, Tennessee, near the Smoky Mountains. Flint from these caverns was used by the Eastern Woodland Indians to create arrowheads, knives, and scrapers. The cave also contains a large wall of rare cave onyx. In the early twentieth century, these caverns were used to make moonshine. In the 1960s, plans began to excavate the cave as a natural attraction for the public. After 3 years of planning and development, Forbidden Caverns was opened in 1967.