TalkingTree.com
La Gruta (107 of 121)
 This tunnel is naturally saturated with this spectacular blue light refracting from the outside pool.  The temperature rises as you enter deeper into the darkness, and a heavy steam fills the air.

 Use [F11] key for a better view
This tunnel is naturally saturated with this spectacular blue light refracting from the outside pool. The temperature rises as you enter deeper into the darkness, and a heavy steam fills the air.