We noticed that you're using an unsupported browser. The Tripadvisor website may not display properly.We support the following browsers:
Windows: Internet Explorer, Mozilla Firefox, Google Chrome. Mac: Safari.

ASP Adventure

Valkenburg, The Netherlands
About ASP Adventure
Are you looking for an unforgettable and unique experience? Descend into the marl caves of Valkenburg and discover the unknown! Underground experiences: ASP Adventure organizes active and challenging activities for individulas and groups in the largest underground marl galleries of Europe. Descend into the dark depths, move towards the flickering candlelight and experience the exceptional stories that have been hidden underground. Follow the guide into the mysterious pale-yellow marlstone corridors by cave bike or on foot. Join us on this journey and discover an unknown world. Outdoor activities: There's also plenty to discover above ground. The hilly landscape of Limburg - with its beautiful nature and rich historical past - offers the perfect scenery for original experiences for groups and teams of all types and sizes; on foot, by mountain bike or on groundbreaking heights...
Read more
Closed Now
Hours Today: 9:00 AM - 5:30 PM
See all hours
What is Travelers’ Choice?
Tripadvisor gives a Travelers’ Choice award to accommodations, attractions and restaurants that consistently earn great reviews from travelers and are ranked within the top 10% of properties on Tripadvisor.
Travelers talk about

ASP Adventure
Booking unavailable on Tripadvisor

Want other options you can book now?
Traveler rating
  • 93
  • 59
  • 4
  • 3
  • 2
Traveler type
Time of year
  • More
Selected filters
  • Filter
  • English
Popular mentions
Paul v wrote a review Oct 2020
Amsterdam, The Netherlands761 contributions200 helpful votes
Checking is a little barn outside of Valkenburg. After that 40 meters of stairs down below. After a short intro you get on a bike and go into the handmade tunnels. Some stops about the tunnels and after unfortunately 1.5 hr your are up the surface again. Not real though ride, perfect for all ages
Read more
Date of experience: October 2020
2 Helpful votes
Sean H wrote a review Oct 2020
Hilversum, The Netherlands9 contributions1 helpful vote
We enjoyed as family with two teenage daughters. We all enjoyed the opportunity to cycle in very old but still active mine; limestone. Our guide Max was great. The team ensured that the session went ahead with normal health & safety and new provisions for Covid.
Read more
Date of experience: October 2020
Gra wrote a review Jun 2020
Vilnius, Lithuania10 contributions
Review of: Grotbiken
Cycling in Valkenburg marl caves was incredible experience. Excellent organisation (dank u wel Danielle!) and guide ( dank u Boris) , 1.30 hour went smoothly. Safe, interesting ride. The guide made few stops to tell us about limestone excavations. Guide adapts to your group - should you want riding faster - you will cycle more kilometers (10-12). We made some 8. Kids liked it very much. (they have to be taller than 1.40 m.) Beware of ceilings:) Helmets and bicycles (chainless, shaft driven bicycles !!!!) are provided, you just need to climb down to fetch them. Before you cycle, you are offered tea and coffee. The distance is kept, disinfectant is always provided. Ride is safe, the guide always check whether everybody follows by calling the name of the last cyclists (and waiting from a signal to come back from him) . He tells when to duck, when to step-off, when to turn (if sharp turn awaits). "Grotbiken" is another reason alongside the plenty of others to visit one of the most beautiful Dutch towns - Valkenburg. Tot ziens!
Read more
Date of experience: June 2020
Hulsebosch Fami... H wrote a review Nov 2018
Cessy, France44 contributions58 helpful votes
We had a spectacular day, our group was full of fit people, so at pretty high speed we were crossing through the tunnels, great fun and very unique way to see this place. The guide did a good job explaining the history.
Read more
Date of experience: November 2018
2 Helpful votes
Catherine C wrote a review Jul 2018
Leuven, Belgium80 contributions26 helpful votes
Finaly a atypical (teambuilding) activity suitable for all: sportive and non sportive people. Bicycling in mergel caves. Great way to explore the underground and a hidden chapel. Sure teens would love it as well! Nonsuitable for people with claustrofobia or hyperventilation, but great for all!
Read more
Date of experience: June 2018
Recommended experiences in and around Valkenburg
from $277.73
More Info