Valkenburg caves
E1172146
UNEXPLORED
The Valkenburg caves are an extensive network of man-made limestone tunnels in Valkenburg, the Netherlands, known for their historic quarries, underground art, and popular guided tours.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Valkenburg caves canonical | 1 |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.