I've been privileged to see some impressive roof gardens, but this one, which we came across quite by chance a couple of days ago, is unquestionably one of the best. The plants were a mix of edible and ornamental varieties. Note the impressive red-hot poker plant on the right near the peak of the roof.
The walls appear to be mud brick, and the house has a rainwater tank and solar panels, altogether a model of sustainability.
We would like to have gone closer but it also had a protective dog.