Attracting 500,000 visitors per year, Luray Caverns is a godsend for caving enthusiasts - showcasing a fascinating alien world filled with beautiful limestone structures and mirrored pools.

The "Wishing Well" full of coins tossed by tourists is seen on August 11, 2012 in Luray Caverns in Luray, Viriginia. The monies collected here are donated to various charitable organizations. AFP PHOTO/Karen BLEIER