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Adventure Tour, Fault Room The Hidden Passages Adventure Tour possesses soda straw formations in excess of 6 feet long. The last room of the cavern, the Fault Room, features a number of faults plus the longest soda straw formation in the cavern. At 14 feet in length, this soda straw is among the longest in North America.	Adventure Tour, Shaft Entrance Guests on the Hidden Passages Adventure Tour are lowered into the cavern on a rope by winch through a 160 foot deep well shaft. The shaft entrance emerges in the spectacular Cathedral room.	Castle of the White Giants (1) Rimstone pools and a magnificent flowstone formation called the Bomb Burst grace the entrance to the Castle of the White Giants. The room is 50 feet tall, 50 feet wide, and 250 feet long the second-largest room in the caverns.	Castle of the White Giants (2) The Watchtower is the tallest column in Natural Bridge Caverns, spanning the 50 foot height of the Castle of the White Giants.


Castle of the White Giants (3) A look back into the Castle of the White Giants provides a closer view of the Chandelier (left) and the back of the Mount of the Landlord (right).	Discovery Adventure Tour The wild cave portion of the Discovery Adventure Tour presents guests with a number of challenging obstacles. Included on the tour is a 25-foot free climb up a mud-covered slope, a 50 foot belly crawl through an area known as the Birth Canal, and a short traverse over a pit.	Emerald Lake Emerald Lake is a very active part of the cavern, with a nearly constant drip of water supplying the glistening surface of the flowstone that surrounds the pool of water. The water in Emerald Lake appears green due to the refraction of light through the pool.	Hidden Passages Hidden Passages Tour The Hidden Passages Illuminations Tour takes place in a section of the cavern discovered several years after the opening of the original Discovery Passages. Smaller groups and a close-up view of fragile and rare formations make this tour a more personalized experience.


Hidden Passages Tour The Illuminations Tour through the Hidden Passages features a state-of the art lighting system that dramatically highlights the special features of the cavern. It also features a brief "total darkness" experience.	Hidden Passages Tour, Cathedral Room (H) Translucent flowstone sparkles under the countless formations in the richly decorated chamber called the Cathedral Room. A state-of the-art lighting system uses light and darkness together to draw attention to unique and delicate cave formations.	Hidden Passages Tour, Cathedral Room (V) A myriad of stalagmites rise up from the flowstone floor of the Cathedral Room to mingle with stalactites and slender draperies, creating the impression of an ornately decorated church.	Gem Pan Mining Sluice Amethyst, rose quartz, emeralds and other treasures are awaiting discovery at the Natural Bridge Mining Company. Guests purchase a bag of "rough" which they then pour into screen-bottomed baskets. Flowing water reveals sparkling gemstones, arrowheads, or even fossils.


Hidden Passages Tour, Broom Closet Densely packed formations in this area provide a close view of many varieties of formations at once. Strips of "cave bacon" are colored by organic acid from the soil above the cave.	Zip2 A guest travels at speeds of up to 25 miles per hour along one of the 350-foot zip lines at the Watchtower Challenge. Named after the Watchtower, which is the tallest formation in the caverns, the Watchtower Challenge, like its namesake, stands 50 feet tall. In addition to the zip lines, climbing surfaces on the Watchtower Challenge offer routes for adult and child climbers alike.	The Natural Bridge The entrance to Natural Bridge Caverns Discovery Tour and the name sake "Natural Bridge."