The cave is part of a massive karst system created by the Lurbach stream, which disappears underground and re-emerges as the Schockelbach.
The 'Großer Dom' is 120 meters long, 80 meters wide, and 40 meters high.
The Lurgrotte is divided into two sections—Peggau and Semriach—which were once connected but are now separated by massive rock collapses.
Archaeological findings in the cave include prehistoric tools and animal remains, indicating early human presence.
The cave temperature remains constant at approximately 10 degrees Celsius throughout the year.
Hydrological tracing tests have proven the underground water connection between the two sides of the cave system.
Lurgrotte Peggau is Austria's largest active water-bearing show cave, situated north of Graz. The cave system is formed by the Lurbach river, which flows through the limestone massif of the Tanneben. Visitors explore a series of massive chambers, including the 'Großer Dom', one of the largest cave halls in Austria. The cave features extensive dripstone formations, stalactites, and stalagmites that have been evolving for thousands of years. It serves as an active drainage path for the karst plateau above. The tour route follows the path carved by the underground river, highlighting the geological force of water. The site is part of a larger, interconnected subterranean network that reaches towards the Semriach side of the mountain.
The Great Dome (Großer Dom) provides the most dramatic scale for photography.
Wear sturdy, non-slip footwear as the cave paths are naturally damp and can be slippery.
Bring a warm jacket or fleece, as the interior temperature stays cool regardless of external summer heat.
Check official channels for water levels, as severe rainfall can occasionally impact accessibility.
Do not attempt to touch the cave walls or formations; the natural oils on your skin can permanently discolor the mineral structures.
Tours are seasonal and typically operate from spring through autumn; closed during winter months.
Touching the stalactites is strictly prohibited to prevent damage from oils on human skin; stay with the guided group at all times.
