Ledenika Cave, Bulgaria

Silhouetted visitor standing in a dark chamber of Ledenika Cave

Blue-lit cavern and footbridge inside Ledenika Cave

Visitor climbing illuminated steps through a dark cave hall

Narrow limestone passage lit with warm amber light

Tour group bending through a low tunnel in Ledenika Cave

Steep staircase disappearing into a dark cave passage

Black-and-white columns of flowstone inside Ledenika Cave

Illuminated cave formations surrounding a metal staircase

Close view of textured mineral deposits on a cave formation

Tall stalactites and a staircase in a black-and-white cave chamber