Who built underground tunnels at Welbeck Abbey?

The underground tunnels at Welbeck Abbey were built by the 5th Duke of Portland, William John Cavendish-Bentinck, in the 19th century. These extensive tunnels were used for various purposes, including recreation and as a means of transporting goods discreetly around the estate. They reflect the Duke's eccentricity and interest in creating a unique living environment. The tunnels are part of the larger historical and architectural significance of Welbeck Abbey.