Most of the tours are significantly longer, and there's far more history involved. Diamond Caverns probably gets the edge for its formations, though Cleveland Avenue is well decorated with a different type of formation. You might see better colors at Diamond, but Frozen the Niagara tour is going to be fairly similar.
Carlsbad Caverns has 30 miles of mapped caves. Mammoth Cave National Park in Kentucky is home to the largest known cave system on Earth, with more than 405 miles.
Credit: Daily Sabah. With a record depth of 2,212 meters (7,257 feet), the Verëvkina (Veryovkina) cave is the deepest cave measured thus far in the world. It's located in the Arabika Massif in Abkhazia, a breakaway region of Georgia that is supported by Russia.
The Largest Cave In Carlsbad Caverns Is Over 100 MilesAs of July 2019, Lechuguilla is one of the ten longest caves in the world (one of the four longest in the United States) and the second deepest limestone cave in the country.