I have vivid memories of the trip my husband (who is also my trusted photographer) and I made to the Princess Diana Playground in Hyde Park, London. The playground opened in 2000 and we made our way there in 2004. It was a bleak, bitterly cold December morning, just after the opening hour. There were no children anywhere. We walked up to a high gate and heard from an anonymous voice (with hindsight, the camera and speaker system were stunningly advanced for a decade ago) that we could not enter without a child.
The faceless gate did not want to hear that I had a contract to write a book about playgrounds and that this was a professional visit. No kids meant no access. I was that told that somewhere- quite far away-I could appeal the judgment but we were actually headed to the airport. We settled for walking around the perimeter; my spouse took copious photos by placing his close up lens through the bars of the fence.