Gardens Near and Far
European broadcaster ARTE has at the moment quite a number of episodes of its garden series Gardens Near and Far on its site.
In this series a French landscape gardener visits gardens all over the world.
The series is in French, but with English subtitles already blended in.
There is also a French version without subtitles, and a synchronised German one, if you prefer those...
Each episode is just under 30 minutes long and they visited some quite amazing gardens.
Unfortunately ARTE doesn't keep stuff on the site very long, so watch while it's there.