Crystal Caverns is a small cavern in Clay, Alabama that was once tourist destination. Over the years Crystal Caverns has been called McClunney Cave and Alabama Cave. Crystal Caverns contains crystal formations and was once used during the Civil War as a saltpeter mine. Thomas McCluney discovered the cavern in 1840 and was once a busy attraction for the city of Clay. Crystal Caverns closed it doors in the 1960's and now is located on private property.