Parco naturale delle Grotte di Oliero, Nature reserve and cave system in Valbrenta, Italy.
The Parco naturale delle Grotte di Oliero is a nature reserve in the Valbrenta valley in northern Italy, built around an underground cave system carved through limestone by water over a very long time. The caves consist of wide passages and chambers, with an underground river running through them that flows beneath the surrounding hills.
The caves were first documented scientifically in 1804, which led to a series of geological studies in the region. Those early investigations brought the underground water system beneath the Asiago plateau to wider attention.
The park has a small geology museum with minerals and fossils that show how water has shaped the limestone over time. The displays are easy to follow and open to all ages.
The caves are visited on guided boat tours, with safety equipment provided on site. It is a good idea to bring a warm layer, as the temperature inside stays cool throughout the year.
The cave system contains the deepest known siphon in Europe, dropping 135 meters and connecting to an underground river network that stretches far beneath the Asiago plateau. This draws specialist diving teams who come specifically to explore its depths.
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