Away from the crowds... dark and mysterious... these are the caves, the fort, and the Kazematten tunnels. They are quite literally the foundations of Maastricht. 


Dear visitor and lover of underground and above-ground Maastricht,
Some of our Underground activities will be open again as from 1 June!
We are, of course, thrilled to announce this and are looking forward to seeing you again and taking you along with us into our unique subterranean world.

To make sure that we can continue to give you our guided tours in the future, we have taken a number of measures for both your and our safety.

Click here for more information about the measures.


Underground, time stands still and the online world doesn't exist. Visit the most secret part of the city with an Official Maastricht Guide. The extensive underground tunnel system will amaze you while the stories and anecdotes told by our Official Maastricht Guides bring history back to life. In a whirl of stories, they take you back to times of foreign occupation, sieges, and people forced to hide underground.