Among the rolling mountains of Southern New Mexico lies Fort Stanton Snowy River National Conservation Area. Once home to Billy the Kid, occupied by both Union and Confederate Armies, the Buffalo Soldiers and the Apache Mescalero tribe, its history and culture are rich. Today it remains largely as it existed 150 years ago, offering new opportunities above and below ground. Directly beneath this postcard New Mexico Landscape is fort Stanton Cave, an obscure recreational caving site since the 1960s. But in 2001 spelunkers investigating signs of additional caves revealed Snowy River Passage, an endless series of tunnels whose floors are lined with white calcite deposits, the longest formation of its kind in the world.