As we toured around the deep caverns of Luray Caverns near the Shenandoah National Park in Virginia, we came upon many wondrous sights. I tended to really like the water features with their reflections of the stalactites above. This pool was called the Wishing Well and people could toss coins in the water from above on the bridge of the trail. The copper in the coins leeches out over time and makes the water a lovely shade of turquoise. I think there is several feet of coins in the bottom in areas.