Reichenwaldhöhle

The Reichenwaldhöhle lies in the Reichenwaldberg near Opponitz in Lower Austria. It is a 510-metre cave formed where the Opponitzer limestone meets the Lunzer layers. Experts believe it began as a crack running parallel to the hillside. A fifty-metre passage leads to a chamber filled with rock falls, from which a side passage may connect to the nearby Stefaniehöhle. A thirty-metre tunnel then opens into the large final chamber, and a hundred-metre gallery continues to a smaller space called the Refugium. The cave was declared a natural monument in 1963 by the Federal Monuments Office. Geologists point to the clay inside the cave, which is also split, to show that the crack formed after the last time water shaped the rock. The Hartmanns’ 1985 guidebook to Lower Austrian caves includes a plan of the system. Visitors can walk the main passages and see how the rock layers have shifted over time. Inside, the cave walls show the boundary between the two rock types. The final chamber is the largest open space, while the Refugium is a quieter end point reached by the longest gallery. The rock-fall chamber and side passage give a sense of the cave’s unstable history. The clay layers cut through by the crack help explain how the cave grew. The site remains a quiet place to study geology and enjoy the stillness beneath the hillside.