An accidental museum at 3,300 meters
As Europe's glaciers retreat, they are exposing a new type of archaeological site. High in the Alps, on the Monte Rosa massif, the ice is giving up artifacts frozen for millennia. One of the most productive locations is the Theodul Pass, a high-altitude crossing at 3,295 meters (10,810 feet) that connects Zermatt, Switzerland, with Breuil-Cervinia, Italy. For decades, hikers and archaeologists have found a trail of objects emerging from the shrinking ice, turning this mountain pass into a collection of human history.
The science of glacial archaeology thrives here. Unlike typical archaeological sites, these "ice patches" are not on glaciers that flow and grind objects to dust. Instead, they are stationary fields of ice that have accumulated over centuries, preserving organic materials like wood, leather, and textiles in a deep freeze. A Neolithic stone axe found in 1895, dated to between 4000 and 3500 BCE, provided the first clue that the pass was used in prehistory. The sheer number and variety of finds show continuous use of this treacherous route during several distinct historical periods, from the Bronze Age through the Roman era and into early modern times.
A timeline emerges from the ice
Radiocarbon dating of the organic artifacts reveals a detailed history of the pass's use. The earliest evidence of significant traffic dates back to the Neolithic period, around 5,000 years ago, a time that coincides with the famous ice-mummy Ötzi, who was found on another Alpine glacier in 1991. Finds from this era show that people braved the extreme altitude to travel and trade. Then, the route appears to have been abandoned. Evidence points to a period of climate change known as the Neolithic Cooling, which made the crossing impassable as glaciers advanced. For thousands of years, the pass was largely unused.
Activity resumed during a warmer period in the Roman era, from the 1st to the 4th century CE. A hoard of Roman coins discovered near the top of the pass confirms its use as a trade route during this time. More recent finds show early modern travel. The scattered remains of a wealthy merchant from around 1600 CE were discovered between 1984 and the early 1990s. Among his possessions were ceremonial fencing weapons made in Germany, nearly 200 coins minted in Northern Italy, glass buttons, and fragments of silk clothing. The remains of two mules were also found nearby, suggesting he was part of a trade caravan. These discoveries, preserved for 400 years, show the risks and realities of commerce in the high Alps during the Little Ice Age.