Your Looking the Hall of Giants which is part of Carlsbad Caverns New Mexico. I shoot this back in 2001 using a 35mm camera and 1500 iso film which was petty much state of the art of the time. Here's a hint,park service woun't let you use a tripod off trail so buy a ticket for the elevator the night before and get on the first elevator trip of the morning. You'll have the Kings room petty much to your self for about 45 mins till the people coming down from the natural entrance start arriving.