The Wishing Well glows blue-green at Luray Caverns, Virginia; originally called Luray Cave, which is a large commercial cave just west of Luray, Virginia, USA. Discovered in the Caverns are in the Shenandoah Valley just east of the Allegheny Range
Jacob's Well -- Wimberly, Tx: One of the most significant natural geologic treasures in the Texas Hill Country. It is one of the longest underwater caves in Texas and an artesian spring. Jacob’s Well surges up thousands of gallons of water per minute!