Like moles underground, people who dug this 14-kilometre long system of defensive tunnels under the western side of the city in the 18th century. During the Second World War, the people of Maastricht spent many fearful hours crowded together here, sheltering from bombardments. This tour, which lasts about an hour and is led by a guide, gives you a good impression of how and why this unique monument to the art of war came into being.
On the spot, here are no tickets available for this tour. Buy your tickets in advance online or in the Maastricht Underground Ticketshop (in Fort St. Pieter).
The corridors are 1.80m high. Not suitable for people with claustrophobia.