Negyedhármas Cave is a small, little-known cave tucked into the rocks above Margitliget in the Pilis Mountains, within the Duna-Ipoly National Park. It's a spot for travelers who enjoy stepping off the beaten path and discovering the quieter, rawer side of the mountains.

The entrance lies at the foot of a large rock cluster rising above Margitliget, on its southernmost side. The cave formed in Upper Triassic Dachstein limestone under phreatic conditions, consisting of decaying spherical niches and a fissure. Old, weathered stalactites can still be seen on the walls. The passage is very low and flat, so moving through it means crawling, and a large amount of rock debris inside makes exploration even more challenging. This isn't a cave for casual sightseers, but for cave enthusiasts it offers a genuine little adventure.

The surrounding Oszoly cliffs are a popular destination for rock climbers, and the forest around keeps its wild character throughout the year — the changing light on the rock faces in spring and autumn, and a quiet, snow-dusted stillness in winter.

How to get there

• Margitliget (Csobánka) — a clear path leads to the cave entrance at the base of the rocks, short approach, easy difficulty

Practical information

• No special equipment is needed to visit, but movement inside requires crawling and is uncomfortable
• Large amounts of rock debris inside make the visit more difficult

The cave was first studied in the 1970s by the Szpeleológia caving group, with a detailed survey completed in 1997. At just 5 meters long and 1.3 meters deep, it's tiny — but its research history stretches back decades.