Park Ranger and retired Warren East High School teacher Eric Elder leads visitors down into the mouth of Mammoth Cave before the 45th annual Cave Sing underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)5-year-old Melanie Rives plays with her parents Catherine and Nicholas Rives, who was celebrating his 40th birthday, during the 45th annual Cave Sing in Mammoth Cave’s Rafinesque Hall underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)Park Rangers guard the historic rock formations of Mammoth Cave while a Christmas tree lights up rocky walls during the 45th annual Cave Sing within the historic entrance underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)Heart of Kentucky Choir members perform Christmas songs during the 45th annual Cave Sing within Mammoth Cave’s Rafinesque Hall underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)Cave visitors help each other light candles to illuminate Mammoth Cave’s vast and cold halls while singing “Silent Night” at the close of the 45th annual Cave Sing within the historic entrance of Mammoth Cave underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)Park ranger Hillary Sward plays Christmas songs on the trumpet within the Rotunda of Mammoth Cave during the 45th annual Cave Sing underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)Retired school teacher Marilyn Greely of Campbell county lights her candle with the help of another visitor during the 45th annual Cave Sing within Mammoth’s Cave Rafinesque Hall underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. “The surroundings are so surreal and peaceful,” Greely said after making the 3 hour drive from north Ky. to attend the concert. (Von Smith)Cave goers leave through the mouth of the historic entrance after the 45th annual Cave Sing within Mammoth Cave underneath Edmonson County, Ky. on Sunday, Dec. 1, 2024. (Von Smith)