Valkenburg aan de Geul is a small tourist town in the hilly south of the Netherlands (Limburg province), 10 km east of Maastricht. It is the only town in the Netherlands with a significant hill — the Cauberg — which has made it a regular finish in the Tour de France and Amstel Gold Race. Cycling fans come specifically to ride the climb.
The town is centred on a medieval castle ruin on the hill, partially destroyed on the orders of William III in 1672; the caves beneath it were used during World War II as bomb shelters — and as storage for evacuated Rijksmuseum masterpieces — and can be toured today. The Fluweelengrot and the unusual Roman Catacombs are two other cave systems worth visiting. The town centre has a pedestrian shopping street, restaurants, and bars. It is popular with Dutch and German holiday-makers in summer and known for its underground Christmas market. Maastricht is 10 km west and easily visited as a day trip from Valkenburg, or vice versa.