Tethys shells
An ancient sea in the cave walls.
Christo — CC BY-SA 4.0 · Imre Gábor Bekey — Public domain · Szenti Tamás — CC BY-SA 4.0 · Christo — CC BY-SA 4.0
Pálvölgyi is longer and harder with stairs and squeezes; Szemlő-hegyi is easier and wider, suiting families and asthmatics. A joint ticket covers both, and they are neighbours.
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Hungary's longest cave system beneath a residential district: the Pálvölgyi network runs more than thirty kilometres under Buda's second district, with a five-hundred-metre route of stairs, narrow passages and tall chambers open to visitors — Budapest's real cave, not a built tunnel. Its formation is unusual: dissolved by thermal water rising from below rather than rain seeping down, so its walls carry calcite crystals and coral-like forms instead of the familiar stalactites, and its rock is full of shells from the ancient Tethys sea. Popular names identify the chambers by their shapes: the Crocodile Head, the Theatre Hall, the Octopus. Tours run hourly with iron stairs and passages you stoop through — so it does not suit under-fives or the unsteady. A constant 11 degrees, so bring a layer, and comfortable shoes are essential.
An ancient sea in the cave walls.
The route's tallest chamber.
Szépvölgyi út 162, Budapest