In Bromley Palace Park (aka Civic Centre Grounds) you can find a number of Grade 2 listed features; Ice House, Cascade & Fernery, mock Medieval Folly plus a Ha-Ha! The latter originally consisted of a wall & ditch to keep livestock in the adjacent fields, out of the parkland around the Bishop’s Palace.
The fields and associated animals have long since gone, and have now become the many houses and gardens on the ‘Palace Estate’. However the wall of the Ha Ha! still remains. Recently the undergrowth has been cleared away and the brickwork exposed again as seen below.
This and the other listed features are on the Heritage England list of at risk buildings etc. They are working with Bromley Council, the site owners, in order to restore and protect them for future generations.
You can find out more about this site at Bromley Palace Park (aka Civic Centre).