Mammoth Cave
ADDED: Depends on how to defines largest; but Mammoth - Flint Ridge Caves system has certainly world's longest knowntotal of surveyed passage length, I believe now >400 miles.
The Sarawak Chamber is the largest known cave chamber in the world. The Sarawak Chamber is a cave that is located underground in the country of Malaysia.
The largest cave in Tennessee is the Cumberland Caverns located in McMinnville. It is a popular tourist attraction and offers guided tours for visitors to explore its vast underground chambers and formations.
Mammoth Cave is the largest cave system in all of Kentucky.
Hungary
The Mammoth Cave system, located in Kentucky, is the largest cave in the world.
Mammoth Cave Kentucky
The Son Doong cave is the largest cave in the world. This cave is located in Quang Binh province,Vietnam.
Kentucky.
The world's largest cave system is located in the state of Kentucky. The name of the cave system is Mammoth's Cave. The cave system is part of the national parks.
Mammoth cave.
The world's largest underground cave, Son Doong, is located in Vietnam. Discovered in 2009 in Phong Nha-Ke Bang National Park, it features massive chambers, unique ecosystems, and its own weather system. The cave stretches over 5.5 miles (9 kilometers) long and reaches heights of 650 feet (200 meters) in some areas. Its impressive scale and natural beauty have made it a significant tourist attraction.
The largest discovered underground labyrinth is Carlsbad Caverns in Carlsbad, New Mexico. It has many tunnels and caves that continue for miles.Carlsbad, California is the site of the largest underground labyrinth found in the US. The total length of the labyrinth is still unknown, but the explored part of the main cavern is more than 30 miles long.