Coudersport, Pa -- Coudersport Ice mine, located in Potter County, Pennsylvania, is a natural wonder with a fascinating history. Discovered in 1894 by prospector Billy O'Neil, the site was initially thought to hold silver but revealed a unique ice formation instead. The cold air from the mountain interacts with warm, humid air, creating a unique phenomenon where ice grows even during the warmer months. Visitors can experience temperatures as low as 40F even on hot summer days, with 2-3 foot icicles hanging in the mine.