The Caves of Hundered Pillars, Natural cave system in Arnedo, Spain
The Caves of Hundred Pillars form an extensive underground network distinguished by numerous stone columns shaped by water erosion over time. The complex includes multiple chambers and interconnected passages that create a labyrinthine structure beneath the surface.
The caves formed through natural processes thousands of years ago as water gradually carved through limestone layers. Geological studies of the rock layers reveal different phases of their formation and ongoing natural development.
The caves serve as a gathering space where local communities display regional art and artifacts, making them an active part of the town's cultural life. Visitors can observe how the space functions as a gallery and meeting point throughout the year.
Sturdy footwear and protective helmets are necessary due to low ceilings and uneven ground throughout the passages. The underground environment stays cool and damp year-round, so bringing a light jacket and allowing time for your eyes to adjust to the darkness is wise.
The name comes from the more than one hundred natural stone columns throughout the system, each with distinct mineral compositions that create visual variety. Specialized lighting in the caves highlights these mineral differences, making the columns appear with different tones and patterns as you move through the passages.
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