Which mazes in Europe are worth visiting with children? [closed]

I recently saw a maize maze near my home town in the East Midlands, UK. However, the functionality was fairly basic.

The children loved it though so I wanted to explore other maze options across Europe. Does anyone have any recommendations?

EDIT TO ADD: Please can you annotate your answer with facts, references, white papers and wherever possible independent verified sources assuring that the maze is indeed 1. A maze and 2. Enjoyable by those entering the Maze. Please avoid sponsored corporate websites for facts as they may not be independent and acting as a front for the maze-owner.

In addition, please avoid using any of the following subjective terms including fun, enjoyment, well-worth-the-money or agreeable. Please discard any opinions that were broadcast by children as their judgement cannot be held to the standard required for SE. Children cannot accurately gauge their own enjoyment levels - an algorithm will suffice for computing the optimum amount of fun that can be enjoyed per £ of maze payment.