The caves were expanded significantly in the 17th century by order of Duke Gustav Samuel von Pfalz-Zweibrücken to reinforce his fortress above.
The sand extracted from these tunnels was originally used for glass production and as casting sand for foundries.
During World War II, thousands of Homburg residents sought refuge in these tunnels during Allied bombing raids.
The interior is notable for its 'Schlossberg-sandstone' which exhibits distinct horizontal and diagonal color stratification.
The cave system is artificially carved and does not contain natural stalactites or stalagmites.
The site sits directly beneath the ruins of Hohenburg Castle, which was destroyed by French troops in 1679.
Schlossberghöhlen in Homburg are the largest red sandstone caves in Europe, created primarily through the manual extraction of sand. The extensive labyrinthine tunnels span approximately 5,000 square meters across 12 levels. During the 17th century, the caves served as part of the defensive fortifications for the Homburg castle complex. In the mid-20th century, the tunnels functioned as protected air-raid shelters for the local population. The site features unique geological rock colorations created by layers of iron-rich sandstone. Visitors traverse a self-guided route through several galleries of the former mining operation. The underground environment maintains a constant year-round temperature of approximately 10 degrees Celsius.
The central junction where several main tunnels converge, offering the best view of the sandstone stratification.
Bring a warm jacket as the underground temperature remains cool regardless of the external weather.
Wear comfortable, flat walking shoes with good grip, as the cave floors can be uneven or slightly damp.
Download the site's official app or print the provided maps in advance to help navigate the branching tunnel system.
Do not wander off the marked paths, as some areas of the multi-level mine are closed for structural stability.
Closed for the winter season from early November through late March.
Maintain a quiet tone to respect the historical significance of the site as a wartime shelter.
