The cave formations deep inside Lookout Mountain
Navigating the narrow passages on the tour
Every inch of the wall tells a geological story
Millions of years of water carved all of this
Looking up at the stalactite-covered ceiling
Thousands of years in the making
The guides name the formations — this one's Fish
Can you see the turtle?
Dragon's Foot — one of many named formations on the tour
Standing at the base of the falls, 260 feet underground
The waterfall chamber — worth every step
Ruby Falls — 260 feet underground and 145 feet tall