An ice mine that freezes only in summer: anomaly or mysticism? (11 photos)
In a quiet corner of Pennsylvania, in Potter County, lies a geological anomaly that defies all understanding of the laws of nature. It's a mine shaft, about 12 meters deep, where ice forms not in winter, but in the height of summer. 
When the surface heats up, icicles up to 7.5 meters long and up to a meter thick form inside. And when winter arrives and everything is covered in snow, the ice in the mine... melts without a trace. 
The mine was discovered in 1894 by a prospector named John Dodd (or Billy O'Neill, according to other sources), who was looking for silver but instead stumbled upon an ice cave. 
In the early 20th century, this place became a popular attraction. The ice was used to store food, and the cave was later converted into a tourist attraction. 
What causes this mysterious behavior is not entirely clear, but one theory is that in winter, cold air penetrates cracks in the rock and concentrates in natural chambers. 
In spring and summer, when groundwater appears and humidity increases, this cold air reacts with warm air to form ice. By autumn, the cold reserves are depleted, and the warm air trapped in the rocks emerges and melts the ice. 
Skeptics long disbelieved this phenomenon. In 1911, a visitor from Detroit made a large bet with nine businessmen, claiming the mine was real. They sent inspectors, who confirmed the fact, much to their disappointment. 
In 1990, the mine closed and stood abandoned for a quarter of a century. In 2013, Gary and Diane Buxen purchased the site, carried out restoration, and reopened it to visitors in 2014. The current season runs from late May to early September. 
In the summer of 2025, despite the abnormal heat, record amounts of ice grew here. There was so much of it that the owners had to cut away sections to allow tourists to enter. In one season, the mine was visited by guests from 29 countries. Tourists can peer into the mine through the observation deck and feel the icy breath from the depths when the temperature outside is 30°C. 
