Prince William and Princess Kate have caused a stir recently with the security measures their team have had to install around the perimeter of their brand-new estate. But there's a special feature already created at their new home, Forest Lodge, a ha-ha wall, which provides an element of security but is cleverly made to not compromise the surrounding views. Discover what this is…

What is a ha-ha wall?

The National Trust website explains the type of wall: "A ha-ha is a type of sunken fence that was commonly used in landscaped gardens and parks in the 18th century. The point of the ha-ha was to give the viewer of the garden the illusion of an unbroken, continuous rolling lawn, whilst providing boundaries for grazing livestock." So, where does it get its unique name from? Well, while i

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