Photograph by  silveronewunny
Original submission: http://www.furaffinity.net/full/3729320/
Artist's description below:

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... To Carlsbad Caverns.

Siris and I took advantage of the free admission to the Caverns thats going on through this week till Sunday. This Is a view looking up at the opening of the Natural Cavern Entrance.

"The Natural Entrance route is a self guiding tour available to visitors with plenty of time and in good physical condition. This one mile tour follows the traditional explorer's route, entering the cavern through the large historic natural entrance. The Natural Entrance route descends more than 750 feet into the earth following steep and narrow trails through a tall and spacious trunk passage call the Main Corridor. The route culminates in the underground rest area, near the elevators and the Big Room route starting point. Visitors in good health who plan to take both self guiding tours may enjoy starting with the Natural Entrance route. Highlights along this route include Bat Cave, Devil's Spring, Green Lake Overlook and the Boneyard, a complex maze of highly-dissolved limestone rock reminiscent of swiss cheese. Visitors should watch for Iceberg Rock, a single 200,000 ton boulder that fell from the cave ceiling thousands of years ago."
From;
http://www.carlsbad.caverns.national-park.com/

The hike down from this point is worth the sore calves and rain-soaked hair and clothing! We did this hike wearing our Vibram FiveFingers as well, which I think contributed to the calves being so sore..,

We took a lot more photo's, but this is the only one that came out well due to there still being natural light. Once you hit the "Twilight Zone", ( which is the last point of reach for ANY Natural light in the cave.) Pictures become near impossible to take properly... :/