Zöld-barlang, meaning Green Cave, is a modest but archaeologically remarkable cave tucked into the steep eastern slope of Nagy-Kevély in the Pilis Mountains. Beneath its unassuming entrances lies a record of human presence stretching from the Copper Age through Roman times to the Árpád era.

Formed in thick-bedded white Triassic Dachstein limestone, the cave has a thermal water origin, though it is no longer active and is slowly deteriorating. Inside, visitors can spot spherical niches, cauldron-shaped hollows, small stalactites, ancient karst sediment fill and calcite veins. The surrounding forested slope offers a quiet, shaded atmosphere, especially atmospheric in autumn. The cave takes its name from the green moss covering the walls of its upper entrance.

How to get there

• Follow the green-marked trail toward Budakalász - the cave lies about 40 m from the trail and 20 m higher up, easy to moderate difficulty
• The cave has two entrances roughly 10 m apart - a lower, artificially widened one and an upper, natural one formed by collapse

Practical information

• The cave is unlocked and can be visited without a permit using basic caving equipment
• It is classified as a specially protected cave and a site of significant archaeological importance
• Located within the Duna-Ipoly National Park

Excavations uncovered numerous human and animal bones, including brown bear, cattle, deer, horse and bat remains, along with Copper Age pottery, a Celtic iron spearhead, and a bronze plate of unknown purpose - making this small cave a genuine window into thousands of years of history.