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The Geulhemmer quarry near Valkenburg) has an underground network of approximately 25 kilometers. One section is open to visitors. Remarkable places in the cave include the hidden chapel dated from the French Revolution, Block Breaker Museum, Orange Gallery with medallions of the House of Orange, a Fossil Museum and the rock house. There are guided tours to visit the underground chapels in caves in and around Valkenburg. Guides explain the meaning of numerous murals, made by man in difficult times, when faith was suppressed.