This image shows one of the large cave rooms that make up the tourist-accessible part of the massive Carlsbad Caverns, located under southeast New Mexico.
The description states:
The Dome Room of Carlsbad Caverns branches off from the Big Room a short distance from the Lunch Room. It is a small Chamber not over 150 feet long, but resembles in many respects a highly ornamented chapel. Many rooms of this site are found connect with the Carlsbad Cavern, but this being the most convenient is the best known. At the far end of the room is a small opening known as the “Back Door” or the “Rat Hole” which many people delight to wriggle through in order to feel the thrill of Cave exploration.
Data by The U. S. National Park Service.
–The room named in this card is not identified on the linked page above. This card likely dates from the 1940s.