The Fluweelengrot, or Velvet Cave, is a famous limestone cave located in Valkenburg, the Netherlands. It is known for its unique underground passages and beautiful rock formations. The cave was formed over thousands of years through the erosion of limestone, creating a fascinating network of tunnels. Visitors to the Fluweelengrot can explore its historical significance, as it has been used for various purposes throughout history, including as a refuge during wars. The cave features impressive wall carvings and remnants of ancient mining activities, making it a popular destination for tourists and history enthusiasts alike.