It is one of the most famous.
carlsbad caverns
They are actually Caverns! Created from thousands of years of limestone buildup! the most Famous caverns in the world are in South Eastern New Mexico! They are called: "Carlsbad Caverns" and it is a National Park!
The three miles of permitted visitation of Carlsbad Caverns is one of the most accessible and most beautiful caverns in the world, having one of the largest (in terms of volume) underground rooms anywhere.
Limestone.
The most significant natural feature in Carlsbad Caverns National Park is the extensive network of limestone caverns, including the Big Room, which is the largest underground chamber in North America. Other important features include stalactites, stalagmites, and unique formations such as the Chandelier Ballroom and the Giant Dome.
carlscad caverns
I've been there twice because it is breath-takingly beautiful. My guess is that most of the millions of other visitors do for the same reason.
Is it exceptionally cold? I'd be surprised if it is. I can't speak for Carlsbad Caverns as I've never visited it, nor studied its formal descriptions and survey, but the mean annual air temperature in most major caves stabilises at that of the air in their local area.This makes caves seem warm in Winter and cool in Summer, and if the annual temperature range of New Mexico is high then the effect on the region's caves will be more marked. Given that Carlsbad Caverns are in a hot area in Summer, when I imagine it attracts most visitors, the cave will therefore feel chilly compared to the heat outside.
The great state of TENNESSEE
No, most caverns form below the water table. Caverns are typically formed by the dissolution of underground limestone or other soluble rocks by water, and this process usually occurs below the water table where the rocks are saturated with water.
Luray Caverns is a cave system in Virginia's Shenandoah Valley, known for its stunning rock formations like stalactites and stalagmites. The caverns feature the "Great Stalacpipe Organ," which uses rubber mallets to tap stalactites and create music. Luray Caverns is one of the most visited caves in the United States and offers guided tours year-round.
True.